forked from OSchip/llvm-project
101 lines
2.6 KiB
LLVM
101 lines
2.6 KiB
LLVM
; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=+cmov %s -o - | FileCheck %s --check-prefix=CHECK32
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+cmov %s -o - | FileCheck %s --check-prefix=CHECK64
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define i32 @one32() optsize {
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entry:
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ret i32 1
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; CHECK32-LABEL: one32
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: incl %eax
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; CHECK32-NEXT: ret
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; FIXME: Figure out the best approach in 64-bit mode.
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; CHECK64-LABEL: one32
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; CHECK64: movl $1, %eax
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; CHECK64-NEXT: retq
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}
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define i32 @minus_one32() optsize {
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entry:
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ret i32 -1
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; CHECK32-LABEL: minus_one32
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: decl %eax
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; CHECK32-NEXT: ret
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}
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define i16 @one16() optsize {
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entry:
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ret i16 1
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; CHECK32-LABEL: one16
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: incl %eax
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; CHECK32-NEXT: retl
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}
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define i16 @minus_one16() optsize {
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entry:
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ret i16 -1
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; CHECK32-LABEL: minus_one16
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: decl %eax
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; CHECK32-NEXT: retl
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}
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define i32 @test_rematerialization() optsize {
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entry:
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; Materialize -1 (thiscall forces it into %ecx).
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tail call x86_thiscallcc void @f(i32 -1)
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; Clobber all registers except %esp, leaving nowhere to store the -1 besides
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; spilling it to the stack.
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tail call void asm sideeffect "", "~{eax},~{ebx},~{ecx},~{edx},~{edi},~{esi},~{ebp},~{dirflag},~{fpsr},~{flags}"()
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; -1 should be re-materialized here instead of getting spilled above.
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ret i32 -1
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; CHECK32-LABEL: test_rematerialization
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; CHECK32: xorl %ecx, %ecx
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; CHECK32-NEXT: decl %ecx
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; CHECK32: calll
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: decl %eax
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; CHECK32-NOT: %eax
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; CHECK32: retl
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}
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define i32 @test_rematerialization2(i32 %x) optsize {
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entry:
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; Materialize -1 (thiscall forces it into %ecx).
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tail call x86_thiscallcc void @f(i32 -1)
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; Clobber all registers except %esp, leaving nowhere to store the -1 besides
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; spilling it to the stack.
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tail call void asm sideeffect "", "~{eax},~{ebx},~{ecx},~{edx},~{edi},~{esi},~{ebp},~{dirflag},~{fpsr},~{flags}"()
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; Define eflags.
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%a = icmp ne i32 %x, 123
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%b = zext i1 %a to i32
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; Cause -1 to be rematerialized right in front of the cmov, which needs eflags.
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; It must therefore not use the xor-dec lowering.
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%c = select i1 %a, i32 %b, i32 -1
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ret i32 %c
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; CHECK32-LABEL: test_rematerialization2
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; CHECK32: xorl %ecx, %ecx
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; CHECK32-NEXT: decl %ecx
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; CHECK32: calll
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; CHECK32: cmpl
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; CHECK32: setne
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; CHECK32-NOT: xorl
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; CHECK32: movl $-1
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; CHECK32: cmov
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; CHECK32: retl
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}
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declare x86_thiscallcc void @f(i32)
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