4e2b4f97a0
Allow shrink-wrapping past memory accesses that only access globals or function arguments. This patch uses getUnderlyingObject to try to identify the accessed object by a given memory operand. If it is a global or an argument, it does not access the stack of the current function and should not block shrink wrapping. Note that the caller's stack may get accessed when passing an argument via the stack, but not the stack of the current function. This addresses part of the TODO from D63152. Reviewed By: thegameg Differential Revision: https://reviews.llvm.org/D149668
64 lines
2.0 KiB
LLVM
64 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
;RUN: llc < %s -mtriple=riscv64-unknown-linux-gnu -mattr=+m | FileCheck %s
|
|
|
|
; This test used to cause an infinite loop.
|
|
|
|
@global = global i8 0, align 1
|
|
@global.1 = global i32 0, align 4
|
|
@global.2 = global i8 0, align 1
|
|
@global.3 = global i32 0, align 4
|
|
|
|
define signext i32 @wobble() nounwind {
|
|
; CHECK-LABEL: wobble:
|
|
; CHECK: # %bb.0: # %bb
|
|
; CHECK-NEXT: lui a0, %hi(global)
|
|
; CHECK-NEXT: lbu a0, %lo(global)(a0)
|
|
; CHECK-NEXT: lui a1, %hi(global.2)
|
|
; CHECK-NEXT: lbu a1, %lo(global.2)(a1)
|
|
; CHECK-NEXT: addi a0, a0, 1
|
|
; CHECK-NEXT: lui a2, %hi(global.1)
|
|
; CHECK-NEXT: sw a0, %lo(global.1)(a2)
|
|
; CHECK-NEXT: mul a0, a0, a1
|
|
; CHECK-NEXT: slli a1, a0, 48
|
|
; CHECK-NEXT: lui a2, 52429
|
|
; CHECK-NEXT: slli a2, a2, 4
|
|
; CHECK-NEXT: mulhu a1, a1, a2
|
|
; CHECK-NEXT: srli a1, a1, 18
|
|
; CHECK-NEXT: lui a2, %hi(global.3)
|
|
; CHECK-NEXT: li a3, 5
|
|
; CHECK-NEXT: sw a1, %lo(global.3)(a2)
|
|
; CHECK-NEXT: bltu a0, a3, .LBB0_2
|
|
; CHECK-NEXT: # %bb.1: # %bb10
|
|
; CHECK-NEXT: addi sp, sp, -16
|
|
; CHECK-NEXT: sd ra, 8(sp) # 8-byte Folded Spill
|
|
; CHECK-NEXT: call quux@plt
|
|
; CHECK-NEXT: ld ra, 8(sp) # 8-byte Folded Reload
|
|
; CHECK-NEXT: addi sp, sp, 16
|
|
; CHECK-NEXT: .LBB0_2: # %bb12
|
|
; CHECK-NEXT: li a0, 0
|
|
; CHECK-NEXT: ret
|
|
bb:
|
|
%tmp = load i8, ptr @global, align 1
|
|
%tmp1 = zext i8 %tmp to i32
|
|
%tmp2 = add nuw nsw i32 %tmp1, 1
|
|
store i32 %tmp2, ptr @global.1, align 4
|
|
%tmp3 = load i8, ptr @global.2, align 1
|
|
%tmp4 = zext i8 %tmp3 to i32
|
|
%tmp5 = mul nuw nsw i32 %tmp2, %tmp4
|
|
%tmp6 = trunc i32 %tmp5 to i16
|
|
%tmp7 = udiv i16 %tmp6, 5
|
|
%tmp8 = zext i16 %tmp7 to i32
|
|
store i32 %tmp8, ptr @global.3, align 4
|
|
%tmp9 = icmp ult i32 %tmp5, 5
|
|
br i1 %tmp9, label %bb12, label %bb10
|
|
|
|
bb10: ; preds = %bb
|
|
%tmp11 = tail call signext i32 @quux()
|
|
br label %bb12
|
|
|
|
bb12: ; preds = %bb10, %bb
|
|
ret i32 undef
|
|
}
|
|
|
|
declare signext i32 @quux(...)
|