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https://github.com/RPCS3/llvm-mirror.git
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f65b040dae
Summary:
When moving add and sub to memory operand instructions,
aarch64-ldst-opt would prematurally pop the stack pointer,
before memory instructions that do access the stack using
indirect loads.
e.g.
```
int foo(int offset){
int local[4] = {0};
return local[offset];
}
```
would generate:
```
sub sp, sp, #16 ; Push the stack
mov x8, sp ; Save stack in register
stp xzr, xzr, [sp], #16 ; Zero initialize stack, and post-increment, making it invalid
------ If an exception goes here, the stack value might be corrupted
ldr w0, [x8, w0, sxtw #2] ; Access correct position, but it is not guarded by SP
```
Reviewers: fhahn, foad, thegameg, eli.friedman, efriedma
Reviewed By: efriedma
Subscribers: efriedma, kristof.beyls, hiraditya, danielkiss, llvm-commits, simon_tatham
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D75755
72 lines
2.2 KiB
LLVM
72 lines
2.2 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-apple-ios | FileCheck %s
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define void @test(float * %p1, i32 %v1) {
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; CHECK-LABEL: test:
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; CHECK: ; %bb.0: ; %entry
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; CHECK-NEXT: sub sp, sp, #16 ; =16
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: ; kill: def $w1 killed $w1 def $x1
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; CHECK-NEXT: fmov.2d v0, #2.00000000
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; CHECK-NEXT: and x8, x1, #0x3
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; CHECK-NEXT: mov x9, sp
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; CHECK-NEXT: str q0, [sp]
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; CHECK-NEXT: bfi x9, x8, #2, #2
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; CHECK-NEXT: ldr s0, [x9]
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; CHECK-NEXT: str s0, [x0]
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; CHECK-NEXT: add sp, sp, #16 ; =16
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; CHECK-NEXT: ret
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entry:
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%v2 = extractelement <3 x float> <float 0.000000e+00, float 2.000000e+00, float 0.000000e+00>, i32 %v1
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store float %v2, float* %p1, align 4
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ret void
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}
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define void @test2(float * %p1, i32 %v1) {
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; CHECK-LABEL: test2:
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; CHECK: ; %bb.0: ; %entry
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; CHECK-NEXT: sub sp, sp, #16 ; =16
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: ; kill: def $w1 killed $w1 def $x1
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; CHECK-NEXT: movi.16b v0, #63
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; CHECK-NEXT: and x8, x1, #0x3
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; CHECK-NEXT: mov x9, sp
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; CHECK-NEXT: str q0, [sp]
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; CHECK-NEXT: bfi x9, x8, #2, #2
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; CHECK-NEXT: ldr s0, [x9]
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; CHECK-NEXT: str s0, [x0]
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; CHECK-NEXT: add sp, sp, #16 ; =16
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; CHECK-NEXT: ret
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entry:
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%v2 = extractelement <3 x float> <float 0.7470588088035583, float 0.7470588088035583, float 0.7470588088035583>, i32 %v1
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store float %v2, float* %p1, align 4
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ret void
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}
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%"st1" = type { %"subst1", %"subst1", %"subst1" }
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%"subst1" = type { %float4 }
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%float4 = type { float, float, float, float }
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@_gv = external unnamed_addr global %"st1", align 8
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define internal void @nvcast_f32_v8i8() {
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; CHECK-LABEL: _nvcast_f32_v8i8
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; CHECK: movi.8b v[[REG:[0-9]+]], #254
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; CHECK: str d[[REG]]
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entry:
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store <2 x float> <float 0xC7DFDFDFC0000000, float 0xC7DFDFDFC0000000>, <2 x float>* bitcast (%"st1"* @_gv to <2 x float>*), align 8
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ret void
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}
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%struct.Vector3 = type { float, float, float }
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define void @nvcast_v2f32_v1f64(%struct.Vector3*) {
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; CHECK-LABEL: _nvcast_v2f32_v1f64
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; CHECK: fmov.2s v[[REG:[0-9]+]], #1.00000000
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; CHECK: str d[[REG]], [x0]
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entry:
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%a13 = bitcast %struct.Vector3* %0 to <1 x double>*
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store <1 x double> <double 0x3F8000003F800000>, <1 x double>* %a13, align 8
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ret void
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}
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