217 lines
5.5 KiB
LLVM
217 lines
5.5 KiB
LLVM
; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=+cmov %s -o - | FileCheck %s --check-prefix=CHECK32
|
|
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+cmov %s -o - | FileCheck %s --check-prefix=CHECK64
|
|
; RUN: llc -mtriple=x86_64-pc-win32 -mattr=+cmov %s -o - | FileCheck %s --check-prefix=CHECKWIN64
|
|
|
|
define i32 @one32_nooptsize() {
|
|
entry:
|
|
ret i32 1
|
|
|
|
; When not optimizing for size, use mov.
|
|
; CHECK32-LABEL: one32_nooptsize:
|
|
; CHECK32: movl $1, %eax
|
|
; CHECK32-NEXT: retl
|
|
; CHECK64-LABEL: one32_nooptsize:
|
|
; CHECK64: movl $1, %eax
|
|
; CHECK64-NEXT: retq
|
|
}
|
|
|
|
define i32 @one32() optsize {
|
|
entry:
|
|
ret i32 1
|
|
|
|
; CHECK32-LABEL: one32:
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: incl %eax
|
|
; CHECK32-NEXT: retl
|
|
|
|
; FIXME: Figure out the best approach in 64-bit mode.
|
|
; CHECK64-LABEL: one32:
|
|
; CHECK64: movl $1, %eax
|
|
; CHECK64-NEXT: retq
|
|
}
|
|
|
|
define i32 @one32_minsize() minsize {
|
|
entry:
|
|
ret i32 1
|
|
|
|
; On 32-bit, xor-inc is preferred over push-pop.
|
|
; CHECK32-LABEL: one32_minsize:
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: incl %eax
|
|
; CHECK32-NEXT: retl
|
|
|
|
; On 64-bit we don't do xor-inc yet, so push-pop it is. Note that we have to
|
|
; pop into a 64-bit register even when we just need 32 bits.
|
|
; CHECK64-LABEL: one32_minsize:
|
|
; CHECK64: pushq $1
|
|
; CHECK64: .cfi_adjust_cfa_offset 8
|
|
; CHECK64: popq %rax
|
|
; CHECK64: .cfi_adjust_cfa_offset -8
|
|
; CHECK64-NEXT: retq
|
|
|
|
; On Win64 we can't adjust the stack unless there's a frame pointer.
|
|
; CHECKWIN64-LABEL: one32_minsize:
|
|
; CHECKWIN64: movl $1, %eax
|
|
; CHECKWIN64-NEXT: retq
|
|
}
|
|
|
|
define i32 @pr26023() minsize {
|
|
entry:
|
|
%x = alloca [120 x i8]
|
|
%0 = getelementptr inbounds [120 x i8], [120 x i8]* %x, i64 0, i64 0
|
|
call void asm sideeffect "", "imr,~{memory},~{dirflag},~{fpsr},~{flags}"(i8* %0)
|
|
%arrayidx = getelementptr inbounds [120 x i8], [120 x i8]* %x, i64 0, i64 119
|
|
store volatile i8 -2, i8* %arrayidx
|
|
call void asm sideeffect "", "r,~{dirflag},~{fpsr},~{flags}"(i32 5)
|
|
%1 = load volatile i8, i8* %arrayidx
|
|
%conv = sext i8 %1 to i32
|
|
ret i32 %conv
|
|
|
|
; The function writes to the redzone, so push/pop cannot be used.
|
|
; CHECK64-LABEL: pr26023:
|
|
; CHECK64: movl $5, %ecx
|
|
; CHECK64: retq
|
|
|
|
; 32-bit X86 doesn't have a redzone.
|
|
; CHECK32-LABEL: pr26023:
|
|
; CHECK32: pushl $5
|
|
; CHECK32: popl %ecx
|
|
; CHECK32: retl
|
|
}
|
|
|
|
|
|
define i64 @one64_minsize() minsize {
|
|
entry:
|
|
ret i64 1
|
|
; On 64-bit we don't do xor-inc yet, so push-pop it is.
|
|
; CHECK64-LABEL: one64_minsize:
|
|
; CHECK64: pushq $1
|
|
; CHECK64: .cfi_adjust_cfa_offset 8
|
|
; CHECK64: popq %rax
|
|
; CHECK64: .cfi_adjust_cfa_offset -8
|
|
; CHECK64-NEXT: retq
|
|
|
|
; On Win64 we can't adjust the stack unless there's a frame pointer.
|
|
; CHECKWIN64-LABEL: one64_minsize:
|
|
; CHECKWIN64: movl $1, %eax
|
|
; CHECKWIN64-NEXT: retq
|
|
}
|
|
|
|
define i32 @minus_one32() optsize {
|
|
entry:
|
|
ret i32 -1
|
|
|
|
; CHECK32-LABEL: minus_one32:
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: decl %eax
|
|
; CHECK32-NEXT: retl
|
|
}
|
|
|
|
define i32 @minus_one32_minsize() minsize {
|
|
entry:
|
|
ret i32 -1
|
|
|
|
; xor-dec is preferred over push-pop.
|
|
; CHECK32-LABEL: minus_one32_minsize:
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: decl %eax
|
|
; CHECK32-NEXT: retl
|
|
}
|
|
|
|
define i16 @one16() optsize {
|
|
entry:
|
|
ret i16 1
|
|
|
|
; CHECK32-LABEL: one16:
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: incl %eax
|
|
; CHECK32-NEXT: # kill
|
|
; CHECK32-NEXT: retl
|
|
}
|
|
|
|
define i16 @minus_one16() optsize {
|
|
entry:
|
|
ret i16 -1
|
|
|
|
; CHECK32-LABEL: minus_one16:
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: decl %eax
|
|
; CHECK32-NEXT: # kill
|
|
; CHECK32-NEXT: retl
|
|
}
|
|
|
|
define i32 @minus_five32() minsize {
|
|
entry:
|
|
ret i32 -5
|
|
|
|
; CHECK32-LABEL: minus_five32:
|
|
; CHECK32: pushl $-5
|
|
; CHECK32: popl %eax
|
|
; CHECK32: retl
|
|
}
|
|
|
|
define i64 @minus_five64() minsize {
|
|
entry:
|
|
ret i64 -5
|
|
|
|
; CHECK64-LABEL: minus_five64:
|
|
; CHECK64: pushq $-5
|
|
; CHECK64: .cfi_adjust_cfa_offset 8
|
|
; CHECK64: popq %rax
|
|
; CHECK64: .cfi_adjust_cfa_offset -8
|
|
; CHECK64: retq
|
|
}
|
|
|
|
define i32 @rematerialize_minus_one() optsize {
|
|
entry:
|
|
; Materialize -1 (thiscall forces it into %ecx).
|
|
tail call x86_thiscallcc void @f(i32 -1)
|
|
|
|
; Clobber all registers except %esp, leaving nowhere to store the -1 besides
|
|
; spilling it to the stack.
|
|
tail call void asm sideeffect "", "~{eax},~{ebx},~{ecx},~{edx},~{edi},~{esi},~{ebp},~{dirflag},~{fpsr},~{flags}"()
|
|
|
|
; -1 should be re-materialized here instead of getting spilled above.
|
|
ret i32 -1
|
|
|
|
; CHECK32-LABEL: rematerialize_minus_one
|
|
; CHECK32: xorl %ecx, %ecx
|
|
; CHECK32-NEXT: decl %ecx
|
|
; CHECK32: calll
|
|
; CHECK32: xorl %eax, %eax
|
|
; CHECK32-NEXT: decl %eax
|
|
; CHECK32-NOT: %eax
|
|
; CHECK32: retl
|
|
}
|
|
|
|
define i32 @rematerialize_minus_one_eflags(i32 %x) optsize {
|
|
entry:
|
|
; Materialize -1 (thiscall forces it into %ecx).
|
|
tail call x86_thiscallcc void @f(i32 -1)
|
|
|
|
; Clobber all registers except %esp, leaving nowhere to store the -1 besides
|
|
; spilling it to the stack.
|
|
tail call void asm sideeffect "", "~{eax},~{ebx},~{ecx},~{edx},~{edi},~{esi},~{ebp},~{dirflag},~{fpsr},~{flags}"()
|
|
|
|
; Define eflags.
|
|
%a = icmp ne i32 %x, 123
|
|
%b = zext i1 %a to i32
|
|
; Cause -1 to be rematerialized right in front of the cmov, which needs eflags.
|
|
; It must therefore not use the xor-dec lowering.
|
|
%c = select i1 %a, i32 %b, i32 -1
|
|
ret i32 %c
|
|
|
|
; CHECK32-LABEL: rematerialize_minus_one_eflags
|
|
; CHECK32: xorl %ecx, %ecx
|
|
; CHECK32-NEXT: decl %ecx
|
|
; CHECK32: calll
|
|
; CHECK32: cmpl
|
|
; CHECK32: setne
|
|
; CHECK32-NOT: xorl
|
|
; CHECK32: movl $-1
|
|
; CHECK32: cmov
|
|
; CHECK32: retl
|
|
}
|
|
|
|
declare x86_thiscallcc void @f(i32)
|