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Use unsigned comparison in segmented stack prologue.

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This is a comparison of two addresses, and GCC does the comparison unsigned.

Patch by Brian Anderson.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147954 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2012-01-11 18:23:35 +00:00
parent bcb55ce386
commit 313c703831
2 changed files with 7 additions and 1 deletions
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2
lib/Target/X86/X86FrameLowering.cpp
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@ -1405,7 +1405,7 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
// This jump is taken if SP >= (Stacklet Limit + Stack Space required).
// It jumps to normal execution of the function body.
BuildMI(checkMBB, DL, TII.get(X86::JG_4)).addMBB(&prologueMBB);
BuildMI(checkMBB, DL, TII.get(X86::JA_4)).addMBB(&prologueMBB);
// On 32 bit we first push the arguments size and then the frame size. On 64
// bit, we pass the stack frame size in r10 and the argument size in r11.

6
test/CodeGen/X86/segmented-stacks.ll
View File

@ -25,6 +25,7 @@ false:
; X32: test_basic:
; X32: cmpl %gs:48, %esp
; X32-NEXT: ja .LBB0_2
; X32: pushl $4
; X32-NEXT: pushl $12
@ -45,6 +46,7 @@ false:
; X64: test_basic:
; X64: cmpq %fs:112, %rsp
; X64-NEXT: ja .LBB0_2
; X64: movabsq $24, %r10
; X64-NEXT: movabsq $0, %r11
@ -69,6 +71,7 @@ define i32 @test_nested(i32 * nest %closure, i32 %other) {
ret i32 %result
; X32: cmpl %gs:48, %esp
; X32-NEXT: ja .LBB1_2
; X32: pushl $4
; X32-NEXT: pushl $0
@ -76,6 +79,7 @@ define i32 @test_nested(i32 * nest %closure, i32 %other) {
; X32-NEXT: ret
; X64: cmpq %fs:112, %rsp
; X64-NEXT: ja .LBB1_2
; X64: movq %r10, %rax
; X64-NEXT: movabsq $0, %r10
@ -93,6 +97,7 @@ define void @test_large() {
; X32: leal -40012(%esp), %ecx
; X32-NEXT: cmpl %gs:48, %ecx
; X32-NEXT: ja .LBB2_2
; X32: pushl $0
; X32-NEXT: pushl $40012
@ -101,6 +106,7 @@ define void @test_large() {
; X64: leaq -40008(%rsp), %r11
; X64-NEXT: cmpq %fs:112, %r11
; X64-NEXT: ja .LBB2_2
; X64: movabsq $40008, %r10
; X64-NEXT: movabsq $0, %r11