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clang-p2996/llvm/test/Transforms/InstCombine/overflow-mul.ll
Nikita Popov 5918f62301 [InstCombine] Infer zext nneg flag (#71534) 
Use KnownBits to infer the nneg flag on zext instructions.

Currently we only set nneg when converting sext -> zext, but don't set
it when we have a zext in the first place. If we want to use it in
optimizations, we should make sure the flag inference is consistent.
2023-11-08 09:34:40 +01:00

346 lines
12 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=instcombine < %s | FileCheck %s
; The last test needs this weird datalayout.
target datalayout = "i32:8:8"
; Without it, InstCombine will align the pointed on 4 Bytes
; The KnownBitsZero that result from the alignment allows to
; turn:
; and i32 %mul, 255
; to:
; and i32 %mul, 252
; The mask is no longer in the form 2^n-1 and this prevents the transformation.
declare void @use.i64(i64)
; return mul(zext x, zext y) > MAX
define i32 @pr4917_1(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; return mul(zext x, zext y) >= MAX+1
define i32 @pr4917_1a(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_1a(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp uge i64 %mul64, 4294967296
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; mul(zext x, zext y) > MAX
; mul(x, y) is used
define i32 @pr4917_2(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[UMUL_VALUE:%.*]] = extractvalue { i32, i1 } [[UMUL]], 0
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[RETVAL:%.*]] = select i1 [[OVERFLOW]], i32 [[UMUL_VALUE]], i32 111
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%mul32 = trunc i64 %mul64 to i32
%retval = select i1 %overflow, i32 %mul32, i32 111
ret i32 %retval
}
; return mul(zext x, zext y) > MAX
; mul is used in non-truncate
define i64 @pr4917_3(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[L:%.*]] = zext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[R:%.*]] = zext i32 [[Y:%.*]] to i64
; CHECK-NEXT: [[MUL64:%.*]] = mul nuw i64 [[L]], [[R]]
; CHECK-NEXT: [[OVERFLOW:%.*]] = icmp ugt i64 [[MUL64]], 4294967295
; CHECK-NEXT: [[RETVAL:%.*]] = select i1 [[OVERFLOW]], i64 [[MUL64]], i64 111
; CHECK-NEXT: ret i64 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%retval = select i1 %overflow, i64 %mul64, i64 111
ret i64 %retval
}
; return mul(zext x, zext y) <= MAX
define i32 @pr4917_4(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_4(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[TMP0:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[OVERFLOW:%.*]] = xor i1 [[TMP0]], true
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ule i64 %mul64, 4294967295
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; return mul(zext x, zext y) < MAX+1
define i32 @pr4917_4a(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4917_4a(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[TMP0:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[OVERFLOW:%.*]] = xor i1 [[TMP0]], true
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ult i64 %mul64, 4294967296
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; operands of mul are of different size
define i32 @pr4917_5(i32 %x, i8 %y) nounwind {
; CHECK-LABEL: @pr4917_5(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = zext i8 [[Y:%.*]] to i32
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[TMP0]])
; CHECK-NEXT: [[UMUL_VALUE:%.*]] = extractvalue { i32, i1 } [[UMUL]], 0
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[RETVAL:%.*]] = select i1 [[OVERFLOW]], i32 [[UMUL_VALUE]], i32 111
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i8 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%mul32 = trunc i64 %mul64 to i32
%retval = select i1 %overflow, i32 %mul32, i32 111
ret i32 %retval
}
; mul(zext x, zext y) != zext trunc mul
define i32 @pr4918_1(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4918_1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%part32 = trunc i64 %mul64 to i32
%part64 = zext i32 %part32 to i64
%overflow = icmp ne i64 %mul64, %part64
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; mul(zext x, zext y) == zext trunc mul
define i32 @pr4918_2(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4918_2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[TMP0:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[OVERFLOW:%.*]] = xor i1 [[TMP0]], true
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%part32 = trunc i64 %mul64 to i32
%part64 = zext i32 %part32 to i64
%overflow = icmp eq i64 %mul64, %part64
%retval = zext i1 %overflow to i32
ret i32 %retval
}
; zext trunc mul != mul(zext x, zext y)
define i32 @pr4918_3(i32 %x, i32 %y) nounwind {
; CHECK-LABEL: @pr4918_3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%part32 = trunc i64 %mul64 to i32
%part64 = zext i32 %part32 to i64
%overflow = icmp ne i64 %part64, %mul64
%retval = zext i1 %overflow to i32
ret i32 %retval
}
define <4 x i32> @pr20113(<4 x i16> %a, <4 x i16> %b) {
; CHECK-LABEL: @pr20113(
; CHECK-NEXT: [[VMOVL_I_I726:%.*]] = zext <4 x i16> [[A:%.*]] to <4 x i32>
; CHECK-NEXT: [[VMOVL_I_I712:%.*]] = zext <4 x i16> [[B:%.*]] to <4 x i32>
; CHECK-NEXT: [[MUL_I703:%.*]] = mul nuw <4 x i32> [[VMOVL_I_I712]], [[VMOVL_I_I726]]
; CHECK-NEXT: [[TMP:%.*]] = icmp sgt <4 x i32> [[MUL_I703]], <i32 -1, i32 -1, i32 -1, i32 -1>
; CHECK-NEXT: [[VCGEZ_I:%.*]] = sext <4 x i1> [[TMP]] to <4 x i32>
; CHECK-NEXT: ret <4 x i32> [[VCGEZ_I]]
;
%vmovl.i.i726 = zext <4 x i16> %a to <4 x i32>
%vmovl.i.i712 = zext <4 x i16> %b to <4 x i32>
%mul.i703 = mul <4 x i32> %vmovl.i.i712, %vmovl.i.i726
%tmp = icmp sge <4 x i32> %mul.i703, zeroinitializer
%vcgez.i = sext <4 x i1> %tmp to <4 x i32>
ret <4 x i32> %vcgez.i
}
@pr21445_data = external global i32
define i1 @pr21445(i8 %a) {
; CHECK-LABEL: @pr21445(
; CHECK-NEXT: [[UMUL:%.*]] = call { i8, i1 } @llvm.umul.with.overflow.i8(i8 [[A:%.*]], i8 ptrtoint (ptr @pr21445_data to i8))
; CHECK-NEXT: [[CMP:%.*]] = extractvalue { i8, i1 } [[UMUL]], 1
; CHECK-NEXT: ret i1 [[CMP]]
;
%ext = zext i8 %a to i32
%ext2 = zext i8 ptrtoint (ptr @pr21445_data to i8) to i32
%mul = mul i32 %ext, %ext2
%and = and i32 %mul, 255
%cmp = icmp ne i32 %mul, %and
ret i1 %cmp
}
; Negative test: mul(zext x, zext y) may overflow.
define i32 @mul_may_overflow(i32 %x, i32 %y) {
; CHECK-LABEL: @mul_may_overflow(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[L:%.*]] = zext i32 [[X:%.*]] to i34
; CHECK-NEXT: [[R:%.*]] = zext i32 [[Y:%.*]] to i34
; CHECK-NEXT: [[MUL34:%.*]] = mul i34 [[L]], [[R]]
; CHECK-NEXT: [[OVERFLOW:%.*]] = icmp ult i34 [[MUL34]], 4294967296
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i34
%r = zext i32 %y to i34
%mul34 = mul i34 %l, %r
%overflow = icmp ule i34 %mul34, 4294967295
%retval = zext i1 %overflow to i32
ret i32 %retval
}
define i32 @mul_known_nuw(i32 %x, i32 %y) {
; CHECK-LABEL: @mul_known_nuw(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[TMP0:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: [[OVERFLOW:%.*]] = xor i1 [[TMP0]], true
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
entry:
%l = zext i32 %x to i34
%r = zext i32 %y to i34
%mul34 = mul nuw i34 %l, %r
%overflow = icmp ule i34 %mul34, 4294967295
%retval = zext i1 %overflow to i32
ret i32 %retval
}
define i32 @extra_and_use(i32 %x, i32 %y) {
; CHECK-LABEL: @extra_and_use(
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[UMUL_VALUE:%.*]] = extractvalue { i32, i1 } [[UMUL]], 0
; CHECK-NEXT: [[AND:%.*]] = zext i32 [[UMUL_VALUE]] to i64
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: call void @use.i64(i64 [[AND]])
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%and = and i64 %mul64, u0xffffffff
call void @use.i64(i64 %and)
%retval = zext i1 %overflow to i32
ret i32 %retval
}
define i32 @extra_and_use_small_mask(i32 %x, i32 %y) {
; CHECK-LABEL: @extra_and_use_small_mask(
; CHECK-NEXT: [[UMUL:%.*]] = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 [[X:%.*]], i32 [[Y:%.*]])
; CHECK-NEXT: [[UMUL_VALUE:%.*]] = extractvalue { i32, i1 } [[UMUL]], 0
; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[UMUL_VALUE]], 268435455
; CHECK-NEXT: [[AND:%.*]] = zext nneg i32 [[TMP1]] to i64
; CHECK-NEXT: [[OVERFLOW:%.*]] = extractvalue { i32, i1 } [[UMUL]], 1
; CHECK-NEXT: call void @use.i64(i64 [[AND]])
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%and = and i64 %mul64, u0xfffffff
call void @use.i64(i64 %and)
%retval = zext i1 %overflow to i32
ret i32 %retval
}
define i32 @extra_and_use_mask_too_large(i32 %x, i32 %y) {
; CHECK-LABEL: @extra_and_use_mask_too_large(
; CHECK-NEXT: [[L:%.*]] = zext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[R:%.*]] = zext i32 [[Y:%.*]] to i64
; CHECK-NEXT: [[MUL64:%.*]] = mul nuw i64 [[L]], [[R]]
; CHECK-NEXT: [[OVERFLOW:%.*]] = icmp ugt i64 [[MUL64]], 4294967295
; CHECK-NEXT: [[AND:%.*]] = and i64 [[MUL64]], 68719476735
; CHECK-NEXT: call void @use.i64(i64 [[AND]])
; CHECK-NEXT: [[RETVAL:%.*]] = zext i1 [[OVERFLOW]] to i32
; CHECK-NEXT: ret i32 [[RETVAL]]
;
%l = zext i32 %x to i64
%r = zext i32 %y to i64
%mul64 = mul i64 %l, %r
%overflow = icmp ugt i64 %mul64, 4294967295
%and = and i64 %mul64, u0xfffffffff
call void @use.i64(i64 %and)
%retval = zext i1 %overflow to i32
ret i32 %retval
}
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