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clang-p2996/llvm/test/CodeGen/ARM/load-combine.ll
Sanjay Patel e18cc5277f [SDAG] try to canonicalize logical shift after bswap 
When shifting by a byte-multiple:
bswap (shl X, C) --> lshr (bswap X), C
bswap (lshr X, C) --> shl (bswap X), C

This is the backend version of D122010 and an alternative
suggested in D120648.
There's an extra check to make sure the shift amount is
valid that was not in the rough draft.

I'm not sure if there is a larger motivating case for RISCV (bug report?),
but the ARM diffs show a benefit from having a late version of the
transform (because we do not combine the loads in IR).

Differential Revision: https://reviews.llvm.org/D122655
2022-03-30 09:29:32 -04:00

1002 lines
33 KiB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=arm-unknown | FileCheck %s
; RUN: llc < %s -mtriple=armv6-unknown | FileCheck %s --check-prefix=CHECK-ARMv6
; RUN: llc < %s -mtriple=thumbv6m-none-eabi | FileCheck %s --check-prefix=CHECK-THUMBv6
; RUN: llc < %s -mtriple=thumbv7m-none-eabi | FileCheck %s --check-prefix=CHECK-THUMBv7
; i8* p; // p is 1 byte aligned
; (i32) p[0] | ((i32) p[1] << 8) | ((i32) p[2] << 16) | ((i32) p[3] << 24)
define i32 @load_i32_by_i8_unaligned(i32* %arg) {
; CHECK-LABEL: load_i32_by_i8_unaligned:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrb r2, [r0, #1]
; CHECK-NEXT: ldrb r1, [r0]
; CHECK-NEXT: ldrb r3, [r0, #2]
; CHECK-NEXT: ldrb r0, [r0, #3]
; CHECK-NEXT: orr r1, r1, r2, lsl #8
; CHECK-NEXT: orr r1, r1, r3, lsl #16
; CHECK-NEXT: orr r0, r1, r0, lsl #24
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_unaligned:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrb r2, [r0, #1]
; CHECK-ARMv6-NEXT: ldrb r1, [r0]
; CHECK-ARMv6-NEXT: ldrb r3, [r0, #2]
; CHECK-ARMv6-NEXT: ldrb r0, [r0, #3]
; CHECK-ARMv6-NEXT: orr r1, r1, r2, lsl #8
; CHECK-ARMv6-NEXT: orr r1, r1, r3, lsl #16
; CHECK-ARMv6-NEXT: orr r0, r1, r0, lsl #24
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_unaligned:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrb r1, [r0]
; CHECK-THUMBv6-NEXT: ldrb r2, [r0, #1]
; CHECK-THUMBv6-NEXT: lsls r2, r2, #8
; CHECK-THUMBv6-NEXT: adds r1, r2, r1
; CHECK-THUMBv6-NEXT: ldrb r2, [r0, #2]
; CHECK-THUMBv6-NEXT: lsls r2, r2, #16
; CHECK-THUMBv6-NEXT: adds r1, r1, r2
; CHECK-THUMBv6-NEXT: ldrb r0, [r0, #3]
; CHECK-THUMBv6-NEXT: lsls r0, r0, #24
; CHECK-THUMBv6-NEXT: adds r0, r1, r0
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_unaligned:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp2 = load i8, i8* %tmp1, align 1
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 2
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 16
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 3
%tmp15 = load i8, i8* %tmp14, align 1
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = shl nuw nsw i32 %tmp16, 24
%tmp18 = or i32 %tmp13, %tmp17
ret i32 %tmp18
}
; i8* p; // p is 4 byte aligned
; (i32) p[0] | ((i32) p[1] << 8) | ((i32) p[2] << 16) | ((i32) p[3] << 24)
define i32 @load_i32_by_i8_aligned(i32* %arg) {
; CHECK-LABEL: load_i32_by_i8_aligned:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_aligned:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_aligned:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldr r0, [r0]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_aligned:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp2 = load i8, i8* %tmp1, align 4
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 2
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 16
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 3
%tmp15 = load i8, i8* %tmp14, align 1
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = shl nuw nsw i32 %tmp16, 24
%tmp18 = or i32 %tmp13, %tmp17
ret i32 %tmp18
}
; i8* p; // p is 4 byte aligned
; ((i32) p[0] << 24) | ((i32) p[1] << 16) | ((i32) p[2] << 8) | (i32) p[3]
define i32 @load_i32_by_i8_bswap(i32* %arg) {
; BSWAP is not supported by 32 bit target
; CHECK-LABEL: load_i32_by_i8_bswap:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0]
; CHECK-NEXT: mov r1, #65280
; CHECK-NEXT: mov r2, #16711680
; CHECK-NEXT: and r1, r1, r0, lsr #8
; CHECK-NEXT: and r2, r2, r0, lsl #8
; CHECK-NEXT: orr r1, r1, r0, lsr #24
; CHECK-NEXT: orr r0, r2, r0, lsl #24
; CHECK-NEXT: orr r0, r0, r1
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_bswap:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0]
; CHECK-ARMv6-NEXT: rev r0, r0
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_bswap:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldr r0, [r0]
; CHECK-THUMBv6-NEXT: rev r0, r0
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_bswap:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0]
; CHECK-THUMBv7-NEXT: rev r0, r0
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = load i8, i8* %tmp, align 4
%tmp2 = zext i8 %tmp1 to i32
%tmp3 = shl nuw nsw i32 %tmp2, 24
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 16
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 2
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 8
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 3
%tmp15 = load i8, i8* %tmp14, align 1
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = or i32 %tmp13, %tmp16
ret i32 %tmp17
}
; i8* p; // p is 8 byte aligned
; (i64) p[0] | ((i64) p[1] << 8) | ((i64) p[2] << 16) | ((i64) p[3] << 24) | ((i64) p[4] << 32) | ((i64) p[5] << 40) | ((i64) p[6] << 48) | ((i64) p[7] << 56)
define i64 @load_i64_by_i8(i64* %arg) {
; CHECK-LABEL: load_i64_by_i8:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r2, [r0]
; CHECK-NEXT: ldr r1, [r0, #4]
; CHECK-NEXT: mov r0, r2
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i64_by_i8:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrd r0, r1, [r0]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i64_by_i8:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldr r2, [r0]
; CHECK-THUMBv6-NEXT: ldr r1, [r0, #4]
; CHECK-THUMBv6-NEXT: mov r0, r2
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i64_by_i8:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrd r0, r1, [r0]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i64* %arg to i8*
%tmp1 = load i8, i8* %tmp, align 8
%tmp2 = zext i8 %tmp1 to i64
%tmp3 = getelementptr inbounds i8, i8* %tmp, i64 1
%tmp4 = load i8, i8* %tmp3, align 1
%tmp5 = zext i8 %tmp4 to i64
%tmp6 = shl nuw nsw i64 %tmp5, 8
%tmp7 = or i64 %tmp6, %tmp2
%tmp8 = getelementptr inbounds i8, i8* %tmp, i64 2
%tmp9 = load i8, i8* %tmp8, align 1
%tmp10 = zext i8 %tmp9 to i64
%tmp11 = shl nuw nsw i64 %tmp10, 16
%tmp12 = or i64 %tmp7, %tmp11
%tmp13 = getelementptr inbounds i8, i8* %tmp, i64 3
%tmp14 = load i8, i8* %tmp13, align 1
%tmp15 = zext i8 %tmp14 to i64
%tmp16 = shl nuw nsw i64 %tmp15, 24
%tmp17 = or i64 %tmp12, %tmp16
%tmp18 = getelementptr inbounds i8, i8* %tmp, i64 4
%tmp19 = load i8, i8* %tmp18, align 1
%tmp20 = zext i8 %tmp19 to i64
%tmp21 = shl nuw nsw i64 %tmp20, 32
%tmp22 = or i64 %tmp17, %tmp21
%tmp23 = getelementptr inbounds i8, i8* %tmp, i64 5
%tmp24 = load i8, i8* %tmp23, align 1
%tmp25 = zext i8 %tmp24 to i64
%tmp26 = shl nuw nsw i64 %tmp25, 40
%tmp27 = or i64 %tmp22, %tmp26
%tmp28 = getelementptr inbounds i8, i8* %tmp, i64 6
%tmp29 = load i8, i8* %tmp28, align 1
%tmp30 = zext i8 %tmp29 to i64
%tmp31 = shl nuw nsw i64 %tmp30, 48
%tmp32 = or i64 %tmp27, %tmp31
%tmp33 = getelementptr inbounds i8, i8* %tmp, i64 7
%tmp34 = load i8, i8* %tmp33, align 1
%tmp35 = zext i8 %tmp34 to i64
%tmp36 = shl nuw i64 %tmp35, 56
%tmp37 = or i64 %tmp32, %tmp36
ret i64 %tmp37
}
; i8* p; // p is 8 byte aligned
; ((i64) p[0] << 56) | ((i64) p[1] << 48) | ((i64) p[2] << 40) | ((i64) p[3] << 32) | ((i64) p[4] << 24) | ((i64) p[5] << 16) | ((i64) p[6] << 8) | (i64) p[7]
define i64 @load_i64_by_i8_bswap(i64* %arg) {
; CHECK-LABEL: load_i64_by_i8_bswap:
; CHECK: @ %bb.0:
; CHECK-NEXT: push {r11, lr}
; CHECK-NEXT: ldr r1, [r0]
; CHECK-NEXT: mov r12, #65280
; CHECK-NEXT: ldr r0, [r0, #4]
; CHECK-NEXT: mov lr, #16711680
; CHECK-NEXT: and r3, r12, r0, lsr #8
; CHECK-NEXT: and r2, lr, r0, lsl #8
; CHECK-NEXT: orr r3, r3, r0, lsr #24
; CHECK-NEXT: orr r0, r2, r0, lsl #24
; CHECK-NEXT: and r2, r12, r1, lsr #8
; CHECK-NEXT: orr r0, r0, r3
; CHECK-NEXT: and r3, lr, r1, lsl #8
; CHECK-NEXT: orr r2, r2, r1, lsr #24
; CHECK-NEXT: orr r1, r3, r1, lsl #24
; CHECK-NEXT: orr r1, r1, r2
; CHECK-NEXT: pop {r11, lr}
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i64_by_i8_bswap:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrd r2, r3, [r0]
; CHECK-ARMv6-NEXT: rev r0, r3
; CHECK-ARMv6-NEXT: rev r1, r2
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i64_by_i8_bswap:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldr r1, [r0]
; CHECK-THUMBv6-NEXT: ldr r0, [r0, #4]
; CHECK-THUMBv6-NEXT: rev r0, r0
; CHECK-THUMBv6-NEXT: rev r1, r1
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i64_by_i8_bswap:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrd r1, r0, [r0]
; CHECK-THUMBv7-NEXT: rev r0, r0
; CHECK-THUMBv7-NEXT: rev r1, r1
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i64* %arg to i8*
%tmp1 = load i8, i8* %tmp, align 8
%tmp2 = zext i8 %tmp1 to i64
%tmp3 = shl nuw i64 %tmp2, 56
%tmp4 = getelementptr inbounds i8, i8* %tmp, i64 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i64
%tmp7 = shl nuw nsw i64 %tmp6, 48
%tmp8 = or i64 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i64 2
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i64
%tmp12 = shl nuw nsw i64 %tmp11, 40
%tmp13 = or i64 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i64 3
%tmp15 = load i8, i8* %tmp14, align 1
%tmp16 = zext i8 %tmp15 to i64
%tmp17 = shl nuw nsw i64 %tmp16, 32
%tmp18 = or i64 %tmp13, %tmp17
%tmp19 = getelementptr inbounds i8, i8* %tmp, i64 4
%tmp20 = load i8, i8* %tmp19, align 1
%tmp21 = zext i8 %tmp20 to i64
%tmp22 = shl nuw nsw i64 %tmp21, 24
%tmp23 = or i64 %tmp18, %tmp22
%tmp24 = getelementptr inbounds i8, i8* %tmp, i64 5
%tmp25 = load i8, i8* %tmp24, align 1
%tmp26 = zext i8 %tmp25 to i64
%tmp27 = shl nuw nsw i64 %tmp26, 16
%tmp28 = or i64 %tmp23, %tmp27
%tmp29 = getelementptr inbounds i8, i8* %tmp, i64 6
%tmp30 = load i8, i8* %tmp29, align 1
%tmp31 = zext i8 %tmp30 to i64
%tmp32 = shl nuw nsw i64 %tmp31, 8
%tmp33 = or i64 %tmp28, %tmp32
%tmp34 = getelementptr inbounds i8, i8* %tmp, i64 7
%tmp35 = load i8, i8* %tmp34, align 1
%tmp36 = zext i8 %tmp35 to i64
%tmp37 = or i64 %tmp33, %tmp36
ret i64 %tmp37
}
; i8* p; // p[1] is 4 byte aligned
; (i32) p[1] | ((i32) p[2] << 8) | ((i32) p[3] << 16) | ((i32) p[4] << 24)
define i32 @load_i32_by_i8_nonzero_offset(i32* %arg) {
; CHECK-LABEL: load_i32_by_i8_nonzero_offset:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0, #1]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_nonzero_offset:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0, #1]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_nonzero_offset:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: movs r1, #1
; CHECK-THUMBv6-NEXT: ldr r0, [r0, r1]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_nonzero_offset:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr.w r0, [r0, #1]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp2 = load i8, i8* %tmp1, align 4
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 2
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 3
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 16
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 4
%tmp15 = load i8, i8* %tmp14, align 1
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = shl nuw nsw i32 %tmp16, 24
%tmp18 = or i32 %tmp13, %tmp17
ret i32 %tmp18
}
; i8* p; // p[-4] is 4 byte aligned
; (i32) p[-4] | ((i32) p[-3] << 8) | ((i32) p[-2] << 16) | ((i32) p[-1] << 24)
define i32 @load_i32_by_i8_neg_offset(i32* %arg) {
; CHECK-LABEL: load_i32_by_i8_neg_offset:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0, #-4]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_neg_offset:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0, #-4]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_neg_offset:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: subs r0, r0, #4
; CHECK-THUMBv6-NEXT: ldr r0, [r0]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_neg_offset:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0, #-4]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 -4
%tmp2 = load i8, i8* %tmp1, align 4
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 -3
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 -2
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 16
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 -1
%tmp15 = load i8, i8* %tmp14, align 1
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = shl nuw nsw i32 %tmp16, 24
%tmp18 = or i32 %tmp13, %tmp17
ret i32 %tmp18
}
; i8* p; // p[1] is 4 byte aligned
; (i32) p[4] | ((i32) p[3] << 8) | ((i32) p[2] << 16) | ((i32) p[1] << 24)
define i32 @load_i32_by_i8_nonzero_offset_bswap(i32* %arg) {
; CHECK-LABEL: load_i32_by_i8_nonzero_offset_bswap:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0, #1]
; CHECK-NEXT: mov r1, #65280
; CHECK-NEXT: mov r2, #16711680
; CHECK-NEXT: and r1, r1, r0, lsr #8
; CHECK-NEXT: and r2, r2, r0, lsl #8
; CHECK-NEXT: orr r1, r1, r0, lsr #24
; CHECK-NEXT: orr r0, r2, r0, lsl #24
; CHECK-NEXT: orr r0, r0, r1
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_nonzero_offset_bswap:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0, #1]
; CHECK-ARMv6-NEXT: rev r0, r0
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_nonzero_offset_bswap:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: movs r1, #1
; CHECK-THUMBv6-NEXT: ldr r0, [r0, r1]
; CHECK-THUMBv6-NEXT: rev r0, r0
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_nonzero_offset_bswap:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr.w r0, [r0, #1]
; CHECK-THUMBv7-NEXT: rev r0, r0
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 4
%tmp2 = load i8, i8* %tmp1, align 1
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 3
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 2
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 16
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp15 = load i8, i8* %tmp14, align 4
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = shl nuw nsw i32 %tmp16, 24
%tmp18 = or i32 %tmp13, %tmp17
ret i32 %tmp18
}
; i8* p; // p[-4] is 4 byte aligned
; (i32) p[-1] | ((i32) p[-2] << 8) | ((i32) p[-3] << 16) | ((i32) p[-4] << 24)
define i32 @load_i32_by_i8_neg_offset_bswap(i32* %arg) {
; CHECK-LABEL: load_i32_by_i8_neg_offset_bswap:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0, #-4]
; CHECK-NEXT: mov r1, #65280
; CHECK-NEXT: mov r2, #16711680
; CHECK-NEXT: and r1, r1, r0, lsr #8
; CHECK-NEXT: and r2, r2, r0, lsl #8
; CHECK-NEXT: orr r1, r1, r0, lsr #24
; CHECK-NEXT: orr r0, r2, r0, lsl #24
; CHECK-NEXT: orr r0, r0, r1
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_neg_offset_bswap:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0, #-4]
; CHECK-ARMv6-NEXT: rev r0, r0
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_neg_offset_bswap:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: subs r0, r0, #4
; CHECK-THUMBv6-NEXT: ldr r0, [r0]
; CHECK-THUMBv6-NEXT: rev r0, r0
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_neg_offset_bswap:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0, #-4]
; CHECK-THUMBv7-NEXT: rev r0, r0
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 -1
%tmp2 = load i8, i8* %tmp1, align 1
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 -2
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
%tmp9 = getelementptr inbounds i8, i8* %tmp, i32 -3
%tmp10 = load i8, i8* %tmp9, align 1
%tmp11 = zext i8 %tmp10 to i32
%tmp12 = shl nuw nsw i32 %tmp11, 16
%tmp13 = or i32 %tmp8, %tmp12
%tmp14 = getelementptr inbounds i8, i8* %tmp, i32 -4
%tmp15 = load i8, i8* %tmp14, align 4
%tmp16 = zext i8 %tmp15 to i32
%tmp17 = shl nuw nsw i32 %tmp16, 24
%tmp18 = or i32 %tmp13, %tmp17
ret i32 %tmp18
}
declare i16 @llvm.bswap.i16(i16)
; i16* p; // p is 4 byte aligned
; (i32) bswap(p[1]) | (i32) bswap(p[0] << 16)
define i32 @load_i32_by_bswap_i16(i32* %arg) {
; CHECK-LABEL: load_i32_by_bswap_i16:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0]
; CHECK-NEXT: mov r1, #65280
; CHECK-NEXT: mov r2, #16711680
; CHECK-NEXT: and r1, r1, r0, lsr #8
; CHECK-NEXT: and r2, r2, r0, lsl #8
; CHECK-NEXT: orr r1, r1, r0, lsr #24
; CHECK-NEXT: orr r0, r2, r0, lsl #24
; CHECK-NEXT: orr r0, r0, r1
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_bswap_i16:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0]
; CHECK-ARMv6-NEXT: rev r0, r0
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_bswap_i16:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldr r0, [r0]
; CHECK-THUMBv6-NEXT: rev r0, r0
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_bswap_i16:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0]
; CHECK-THUMBv7-NEXT: rev r0, r0
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i16*
%tmp1 = load i16, i16* %tmp, align 4
%tmp11 = call i16 @llvm.bswap.i16(i16 %tmp1)
%tmp2 = zext i16 %tmp11 to i32
%tmp3 = getelementptr inbounds i16, i16* %tmp, i32 1
%tmp4 = load i16, i16* %tmp3, align 1
%tmp41 = call i16 @llvm.bswap.i16(i16 %tmp4)
%tmp5 = zext i16 %tmp41 to i32
%tmp6 = shl nuw nsw i32 %tmp2, 16
%tmp7 = or i32 %tmp6, %tmp5
ret i32 %tmp7
}
; i16* p;
; (i32) p[0] | (sext(p[1] << 16) to i32)
define i32 @load_i32_by_sext_i16(i32* %arg) {
; CHECK-LABEL: load_i32_by_sext_i16:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldr r0, [r0]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_sext_i16:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldr r0, [r0]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_sext_i16:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldr r0, [r0]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_sext_i16:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldr r0, [r0]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i16*
%tmp1 = load i16, i16* %tmp, align 4
%tmp2 = zext i16 %tmp1 to i32
%tmp3 = getelementptr inbounds i16, i16* %tmp, i32 1
%tmp4 = load i16, i16* %tmp3, align 1
%tmp5 = sext i16 %tmp4 to i32
%tmp6 = shl nuw nsw i32 %tmp5, 16
%tmp7 = or i32 %tmp6, %tmp2
ret i32 %tmp7
}
; i8* arg; i32 i;
; p = arg + 12;
; (i32) p[i] | ((i32) p[i + 1] << 8) | ((i32) p[i + 2] << 16) | ((i32) p[i + 3] << 24)
define i32 @load_i32_by_i8_base_offset_index(i8* %arg, i32 %i) {
; CHECK-LABEL: load_i32_by_i8_base_offset_index:
; CHECK: @ %bb.0:
; CHECK-NEXT: add r0, r0, r1
; CHECK-NEXT: ldr r0, [r0, #12]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_base_offset_index:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: add r0, r0, r1
; CHECK-ARMv6-NEXT: ldr r0, [r0, #12]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_base_offset_index:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: adds r0, r0, r1
; CHECK-THUMBv6-NEXT: ldr r0, [r0, #12]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_base_offset_index:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: add r0, r1
; CHECK-THUMBv7-NEXT: ldr r0, [r0, #12]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = add nuw nsw i32 %i, 3
%tmp2 = add nuw nsw i32 %i, 2
%tmp3 = add nuw nsw i32 %i, 1
%tmp4 = getelementptr inbounds i8, i8* %arg, i64 12
%tmp5 = zext i32 %i to i64
%tmp6 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp5
%tmp7 = load i8, i8* %tmp6, align 4
%tmp8 = zext i8 %tmp7 to i32
%tmp9 = zext i32 %tmp3 to i64
%tmp10 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp9
%tmp11 = load i8, i8* %tmp10, align 1
%tmp12 = zext i8 %tmp11 to i32
%tmp13 = shl nuw nsw i32 %tmp12, 8
%tmp14 = or i32 %tmp13, %tmp8
%tmp15 = zext i32 %tmp2 to i64
%tmp16 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp15
%tmp17 = load i8, i8* %tmp16, align 1
%tmp18 = zext i8 %tmp17 to i32
%tmp19 = shl nuw nsw i32 %tmp18, 16
%tmp20 = or i32 %tmp14, %tmp19
%tmp21 = zext i32 %tmp to i64
%tmp22 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp21
%tmp23 = load i8, i8* %tmp22, align 1
%tmp24 = zext i8 %tmp23 to i32
%tmp25 = shl nuw i32 %tmp24, 24
%tmp26 = or i32 %tmp20, %tmp25
ret i32 %tmp26
}
; i8* arg; i32 i;
; p = arg + 12;
; (i32) p[i + 1] | ((i32) p[i + 2] << 8) | ((i32) p[i + 3] << 16) | ((i32) p[i + 4] << 24)
define i32 @load_i32_by_i8_base_offset_index_2(i8* %arg, i32 %i) {
; CHECK-LABEL: load_i32_by_i8_base_offset_index_2:
; CHECK: @ %bb.0:
; CHECK-NEXT: add r0, r1, r0
; CHECK-NEXT: ldr r0, [r0, #13]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: load_i32_by_i8_base_offset_index_2:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: add r0, r1, r0
; CHECK-ARMv6-NEXT: ldr r0, [r0, #13]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: load_i32_by_i8_base_offset_index_2:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: adds r0, r1, r0
; CHECK-THUMBv6-NEXT: movs r1, #13
; CHECK-THUMBv6-NEXT: ldr r0, [r0, r1]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: load_i32_by_i8_base_offset_index_2:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: add r0, r1
; CHECK-THUMBv7-NEXT: ldr.w r0, [r0, #13]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = add nuw nsw i32 %i, 4
%tmp2 = add nuw nsw i32 %i, 3
%tmp3 = add nuw nsw i32 %i, 2
%tmp4 = getelementptr inbounds i8, i8* %arg, i64 12
%tmp5 = add nuw nsw i32 %i, 1
%tmp27 = zext i32 %tmp5 to i64
%tmp28 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp27
%tmp29 = load i8, i8* %tmp28, align 4
%tmp30 = zext i8 %tmp29 to i32
%tmp31 = zext i32 %tmp3 to i64
%tmp32 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp31
%tmp33 = load i8, i8* %tmp32, align 1
%tmp34 = zext i8 %tmp33 to i32
%tmp35 = shl nuw nsw i32 %tmp34, 8
%tmp36 = or i32 %tmp35, %tmp30
%tmp37 = zext i32 %tmp2 to i64
%tmp38 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp37
%tmp39 = load i8, i8* %tmp38, align 1
%tmp40 = zext i8 %tmp39 to i32
%tmp41 = shl nuw nsw i32 %tmp40, 16
%tmp42 = or i32 %tmp36, %tmp41
%tmp43 = zext i32 %tmp to i64
%tmp44 = getelementptr inbounds i8, i8* %tmp4, i64 %tmp43
%tmp45 = load i8, i8* %tmp44, align 1
%tmp46 = zext i8 %tmp45 to i32
%tmp47 = shl nuw i32 %tmp46, 24
%tmp48 = or i32 %tmp42, %tmp47
ret i32 %tmp48
}
; i8* p; // p is 2 byte aligned
; (i32) p[0] | ((i32) p[1] << 8)
define i32 @zext_load_i32_by_i8(i32* %arg) {
; CHECK-LABEL: zext_load_i32_by_i8:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrh r0, [r0]
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: zext_load_i32_by_i8:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrh r0, [r0]
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: zext_load_i32_by_i8:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrh r0, [r0]
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: zext_load_i32_by_i8:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrh r0, [r0]
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp2 = load i8, i8* %tmp1, align 2
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
ret i32 %tmp8
}
; i8* p; // p is 2 byte aligned
; ((i32) p[0] << 8) | ((i32) p[1] << 16)
define i32 @zext_load_i32_by_i8_shl_8(i32* %arg) {
; CHECK-LABEL: zext_load_i32_by_i8_shl_8:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrb r1, [r0]
; CHECK-NEXT: ldrb r0, [r0, #1]
; CHECK-NEXT: lsl r0, r0, #16
; CHECK-NEXT: orr r0, r0, r1, lsl #8
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: zext_load_i32_by_i8_shl_8:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrb r1, [r0]
; CHECK-ARMv6-NEXT: ldrb r0, [r0, #1]
; CHECK-ARMv6-NEXT: lsl r0, r0, #16
; CHECK-ARMv6-NEXT: orr r0, r0, r1, lsl #8
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: zext_load_i32_by_i8_shl_8:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrb r1, [r0]
; CHECK-THUMBv6-NEXT: lsls r1, r1, #8
; CHECK-THUMBv6-NEXT: ldrb r0, [r0, #1]
; CHECK-THUMBv6-NEXT: lsls r0, r0, #16
; CHECK-THUMBv6-NEXT: adds r0, r0, r1
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: zext_load_i32_by_i8_shl_8:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrb r1, [r0]
; CHECK-THUMBv7-NEXT: ldrb r0, [r0, #1]
; CHECK-THUMBv7-NEXT: lsls r0, r0, #16
; CHECK-THUMBv7-NEXT: orr.w r0, r0, r1, lsl #8
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp2 = load i8, i8* %tmp1, align 2
%tmp3 = zext i8 %tmp2 to i32
%tmp30 = shl nuw nsw i32 %tmp3, 8
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 16
%tmp8 = or i32 %tmp7, %tmp30
ret i32 %tmp8
}
; i8* p; // p is 2 byte aligned
; ((i32) p[0] << 16) | ((i32) p[1] << 24)
define i32 @zext_load_i32_by_i8_shl_16(i32* %arg) {
; CHECK-LABEL: zext_load_i32_by_i8_shl_16:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrb r1, [r0]
; CHECK-NEXT: ldrb r0, [r0, #1]
; CHECK-NEXT: lsl r0, r0, #24
; CHECK-NEXT: orr r0, r0, r1, lsl #16
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: zext_load_i32_by_i8_shl_16:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrb r1, [r0]
; CHECK-ARMv6-NEXT: ldrb r0, [r0, #1]
; CHECK-ARMv6-NEXT: lsl r0, r0, #24
; CHECK-ARMv6-NEXT: orr r0, r0, r1, lsl #16
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: zext_load_i32_by_i8_shl_16:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrb r1, [r0]
; CHECK-THUMBv6-NEXT: lsls r1, r1, #16
; CHECK-THUMBv6-NEXT: ldrb r0, [r0, #1]
; CHECK-THUMBv6-NEXT: lsls r0, r0, #24
; CHECK-THUMBv6-NEXT: adds r0, r0, r1
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: zext_load_i32_by_i8_shl_16:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrb r1, [r0]
; CHECK-THUMBv7-NEXT: ldrb r0, [r0, #1]
; CHECK-THUMBv7-NEXT: lsls r0, r0, #24
; CHECK-THUMBv7-NEXT: orr.w r0, r0, r1, lsl #16
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp2 = load i8, i8* %tmp1, align 2
%tmp3 = zext i8 %tmp2 to i32
%tmp30 = shl nuw nsw i32 %tmp3, 16
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp5 = load i8, i8* %tmp4, align 1
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 24
%tmp8 = or i32 %tmp7, %tmp30
ret i32 %tmp8
}
; i8* p; // p is 2 byte aligned
; (i32) p[1] | ((i32) p[0] << 8)
define i32 @zext_load_i32_by_i8_bswap(i32* %arg) {
; CHECK-LABEL: zext_load_i32_by_i8_bswap:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrb r1, [r0]
; CHECK-NEXT: ldrb r0, [r0, #1]
; CHECK-NEXT: orr r0, r0, r1, lsl #8
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: zext_load_i32_by_i8_bswap:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrh r0, [r0]
; CHECK-ARMv6-NEXT: rev16 r0, r0
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: zext_load_i32_by_i8_bswap:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrh r0, [r0]
; CHECK-THUMBv6-NEXT: rev16 r0, r0
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: zext_load_i32_by_i8_bswap:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrh r0, [r0]
; CHECK-THUMBv7-NEXT: rev16 r0, r0
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp2 = load i8, i8* %tmp1, align 1
%tmp3 = zext i8 %tmp2 to i32
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp5 = load i8, i8* %tmp4, align 2
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 8
%tmp8 = or i32 %tmp7, %tmp3
ret i32 %tmp8
}
; i8* p; // p is 2 byte aligned
; ((i32) p[1] << 8) | ((i32) p[0] << 16)
define i32 @zext_load_i32_by_i8_bswap_shl_8(i32* %arg) {
; CHECK-LABEL: zext_load_i32_by_i8_bswap_shl_8:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrb r1, [r0]
; CHECK-NEXT: ldrb r0, [r0, #1]
; CHECK-NEXT: lsl r1, r1, #16
; CHECK-NEXT: orr r0, r1, r0, lsl #8
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: zext_load_i32_by_i8_bswap_shl_8:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrb r1, [r0]
; CHECK-ARMv6-NEXT: ldrb r0, [r0, #1]
; CHECK-ARMv6-NEXT: lsl r1, r1, #16
; CHECK-ARMv6-NEXT: orr r0, r1, r0, lsl #8
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: zext_load_i32_by_i8_bswap_shl_8:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrb r1, [r0, #1]
; CHECK-THUMBv6-NEXT: lsls r1, r1, #8
; CHECK-THUMBv6-NEXT: ldrb r0, [r0]
; CHECK-THUMBv6-NEXT: lsls r0, r0, #16
; CHECK-THUMBv6-NEXT: adds r0, r0, r1
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: zext_load_i32_by_i8_bswap_shl_8:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrb r1, [r0]
; CHECK-THUMBv7-NEXT: ldrb r0, [r0, #1]
; CHECK-THUMBv7-NEXT: lsls r1, r1, #16
; CHECK-THUMBv7-NEXT: orr.w r0, r1, r0, lsl #8
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp2 = load i8, i8* %tmp1, align 1
%tmp3 = zext i8 %tmp2 to i32
%tmp30 = shl nuw nsw i32 %tmp3, 8
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp5 = load i8, i8* %tmp4, align 2
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 16
%tmp8 = or i32 %tmp7, %tmp30
ret i32 %tmp8
}
; i8* p; // p is 2 byte aligned
; ((i32) p[1] << 16) | ((i32) p[0] << 24)
define i32 @zext_load_i32_by_i8_bswap_shl_16(i32* %arg) {
; CHECK-LABEL: zext_load_i32_by_i8_bswap_shl_16:
; CHECK: @ %bb.0:
; CHECK-NEXT: ldrb r1, [r0]
; CHECK-NEXT: ldrb r0, [r0, #1]
; CHECK-NEXT: lsl r1, r1, #24
; CHECK-NEXT: orr r0, r1, r0, lsl #16
; CHECK-NEXT: mov pc, lr
;
; CHECK-ARMv6-LABEL: zext_load_i32_by_i8_bswap_shl_16:
; CHECK-ARMv6: @ %bb.0:
; CHECK-ARMv6-NEXT: ldrb r1, [r0]
; CHECK-ARMv6-NEXT: ldrb r0, [r0, #1]
; CHECK-ARMv6-NEXT: lsl r1, r1, #24
; CHECK-ARMv6-NEXT: orr r0, r1, r0, lsl #16
; CHECK-ARMv6-NEXT: bx lr
;
; CHECK-THUMBv6-LABEL: zext_load_i32_by_i8_bswap_shl_16:
; CHECK-THUMBv6: @ %bb.0:
; CHECK-THUMBv6-NEXT: ldrb r1, [r0, #1]
; CHECK-THUMBv6-NEXT: lsls r1, r1, #16
; CHECK-THUMBv6-NEXT: ldrb r0, [r0]
; CHECK-THUMBv6-NEXT: lsls r0, r0, #24
; CHECK-THUMBv6-NEXT: adds r0, r0, r1
; CHECK-THUMBv6-NEXT: bx lr
;
; CHECK-THUMBv7-LABEL: zext_load_i32_by_i8_bswap_shl_16:
; CHECK-THUMBv7: @ %bb.0:
; CHECK-THUMBv7-NEXT: ldrb r1, [r0]
; CHECK-THUMBv7-NEXT: ldrb r0, [r0, #1]
; CHECK-THUMBv7-NEXT: lsls r1, r1, #24
; CHECK-THUMBv7-NEXT: orr.w r0, r1, r0, lsl #16
; CHECK-THUMBv7-NEXT: bx lr
%tmp = bitcast i32* %arg to i8*
%tmp1 = getelementptr inbounds i8, i8* %tmp, i32 1
%tmp2 = load i8, i8* %tmp1, align 1
%tmp3 = zext i8 %tmp2 to i32
%tmp30 = shl nuw nsw i32 %tmp3, 16
%tmp4 = getelementptr inbounds i8, i8* %tmp, i32 0
%tmp5 = load i8, i8* %tmp4, align 2
%tmp6 = zext i8 %tmp5 to i32
%tmp7 = shl nuw nsw i32 %tmp6, 24
%tmp8 = or i32 %tmp7, %tmp30
ret i32 %tmp8
}
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