352 lines
9.5 KiB
LLVM
352 lines
9.5 KiB
LLVM
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; 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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; RUN: llc -mtriple=x86_64-pc-win32 -mattr=+cmov %s -o - | FileCheck %s --check-prefix=CHECKWIN64
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; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=+cmov %s -o /dev/null \
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; RUN: -print-after postrapseudos -filter-print-funcs pr26023 2>&1 \
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; RUN: | FileCheck %s --check-prefix=OPERAND32
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+cmov %s -o /dev/null \
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; RUN: -print-after postrapseudos -filter-print-funcs one64_minsize 2>&1 \
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; RUN: | FileCheck %s --check-prefix=OPERAND64
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define i32 @one32_nooptsize() {
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entry:
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ret i32 1
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; When not optimizing for size, use mov.
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; CHECK32-LABEL: one32_nooptsize:
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; CHECK32: movl $1, %eax
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; CHECK32-NEXT: retl
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; CHECK64-LABEL: one32_nooptsize:
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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 @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: retl
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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 @one32_pgso() !prof !14 {
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entry:
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ret i32 1
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; CHECK32-LABEL: one32_pgso:
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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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; FIXME: Figure out the best approach in 64-bit mode.
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; CHECK64-LABEL: one32_pgso:
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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 @one32_minsize() minsize {
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entry:
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ret i32 1
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; On 32-bit, xor-inc is preferred over push-pop.
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; CHECK32-LABEL: one32_minsize:
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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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; On 64-bit we don't do xor-inc yet, so push-pop it is. Note that we have to
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; pop into a 64-bit register even when we just need 32 bits.
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; CHECK64-LABEL: one32_minsize:
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; CHECK64: pushq $1
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; CHECK64: .cfi_adjust_cfa_offset 8
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; CHECK64: popq %rax
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; CHECK64: .cfi_adjust_cfa_offset -8
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; CHECK64-NEXT: retq
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; On Win64 we can't adjust the stack unless there's a frame pointer.
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; CHECKWIN64-LABEL: one32_minsize:
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; CHECKWIN64: movl $1, %eax
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; CHECKWIN64-NEXT: retq
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}
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define i32 @pr26023() minsize {
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entry:
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%x = alloca [120 x i8]
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%0 = getelementptr inbounds [120 x i8], [120 x i8]* %x, i64 0, i64 0
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call void asm sideeffect "", "imr,~{memory},~{dirflag},~{fpsr},~{flags}"(i8* %0)
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%arrayidx = getelementptr inbounds [120 x i8], [120 x i8]* %x, i64 0, i64 119
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store volatile i8 -2, i8* %arrayidx
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call void asm sideeffect "", "r,~{dirflag},~{fpsr},~{flags}"(i32 5)
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%1 = load volatile i8, i8* %arrayidx
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%conv = sext i8 %1 to i32
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ret i32 %conv
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; The function writes to the redzone, so push/pop cannot be used.
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; CHECK64-LABEL: pr26023:
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; CHECK64: movl $5, %ecx
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; CHECK64: retq
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; 32-bit X86 doesn't have a redzone.
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; CHECK32-LABEL: pr26023:
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; CHECK32: pushl $5
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; CHECK32: popl %ecx
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; CHECK32: retl
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; Check push/pop have implicit def/use of $esp
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; OPERAND32: PUSH32i8 5, implicit-def $esp, implicit $esp
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; OPERAND32-NEXT: CFI_INSTRUCTION adjust_cfa_offset 4
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; OPERAND32-NEXT: renamable $ecx = POP32r implicit-def $esp, implicit $esp
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; OPERAND32-NEXT: CFI_INSTRUCTION adjust_cfa_offset -4
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}
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define i64 @one64_minsize() minsize {
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entry:
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ret i64 1
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; On 64-bit we don't do xor-inc yet, so push-pop it is.
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; CHECK64-LABEL: one64_minsize:
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; CHECK64: pushq $1
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; CHECK64: .cfi_adjust_cfa_offset 8
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; CHECK64: popq %rax
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; CHECK64: .cfi_adjust_cfa_offset -8
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; CHECK64-NEXT: retq
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; On Win64 we can't adjust the stack unless there's a frame pointer.
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; CHECKWIN64-LABEL: one64_minsize:
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; CHECKWIN64: movl $1, %eax
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; CHECKWIN64-NEXT: retq
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; Check push/pop have implicit def/use of $rsp
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; OPERAND64: PUSH64i8 1, implicit-def $rsp, implicit $rsp
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; OPERAND64-NEXT: CFI_INSTRUCTION adjust_cfa_offset 8
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; OPERAND64-NEXT: $rax = POP64r implicit-def $rsp, implicit $rsp
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; OPERAND64-NEXT: CFI_INSTRUCTION adjust_cfa_offset -8
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; OPERAND64-NEXT: RET 0, $rax
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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: retl
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}
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define i32 @minus_one32_pgso() !prof !14 {
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entry:
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ret i32 -1
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; CHECK32-LABEL: minus_one32_pgso:
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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 @minus_one32_minsize() minsize {
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entry:
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ret i32 -1
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; xor-dec is preferred over push-pop.
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; CHECK32-LABEL: minus_one32_minsize:
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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 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: # kill
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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: # kill
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; CHECK32-NEXT: retl
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}
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define i16 @one16_pgso() !prof !14 {
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entry:
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ret i16 1
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; CHECK32-LABEL: one16_pgso:
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: incl %eax
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; CHECK32-NEXT: # kill
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; CHECK32-NEXT: retl
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}
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define i16 @minus_one16_pgso() !prof !14 {
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entry:
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ret i16 -1
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; CHECK32-LABEL: minus_one16_pgso:
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; CHECK32: xorl %eax, %eax
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; CHECK32-NEXT: decl %eax
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; CHECK32-NEXT: # kill
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; CHECK32-NEXT: retl
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}
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define i32 @minus_five32() minsize {
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entry:
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ret i32 -5
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; CHECK32-LABEL: minus_five32:
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; CHECK32: pushl $-5
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; CHECK32: popl %eax
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; CHECK32: retl
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}
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define i64 @minus_five64() minsize {
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entry:
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ret i64 -5
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; CHECK64-LABEL: minus_five64:
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; CHECK64: pushq $-5
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; CHECK64: .cfi_adjust_cfa_offset 8
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; CHECK64: popq %rax
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; CHECK64: .cfi_adjust_cfa_offset -8
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; CHECK64: retq
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}
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define i32 @rematerialize_minus_one() 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: rematerialize_minus_one
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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 @rematerialize_minus_one_eflags(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: rematerialize_minus_one_eflags
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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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define i32 @rematerialize_minus_one_pgso() !prof !14 {
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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: rematerialize_minus_one_pgso
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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 @rematerialize_minus_one_eflags_pgso(i32 %x) !prof !14 {
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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: rematerialize_minus_one_eflags_pgso
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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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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"ProfileSummary", !1}
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!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!2 = !{!"ProfileFormat", !"InstrProf"}
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!3 = !{!"TotalCount", i64 10000}
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!4 = !{!"MaxCount", i64 10}
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!5 = !{!"MaxInternalCount", i64 1}
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!6 = !{!"MaxFunctionCount", i64 1000}
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!7 = !{!"NumCounts", i64 3}
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!8 = !{!"NumFunctions", i64 3}
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|
!9 = !{!"DetailedSummary", !10}
|
||
|
|
!10 = !{!11, !12, !13}
|
||
|
|
!11 = !{i32 10000, i64 100, i32 1}
|
||
|
|
!12 = !{i32 999000, i64 100, i32 1}
|
||
|
|
!13 = !{i32 999999, i64 1, i32 2}
|
||
|
|
!14 = !{!"function_entry_count", i64 0}
|