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https://github.com/c64scene-ar/llvm-6502.git
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506ed4d4a5
On pre-v6 hardware, 'MOV lo, lo' gives undefined results, so such copies need to be avoided. This patch trades simplicity for implementation time at the expense of performance... As they say: correctness first, then performance. See http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075998.html for a few ideas on how to make this better. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216138 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.9 KiB
LLVM
54 lines
1.9 KiB
LLVM
; RUN: llc < %s -mtriple=arm-linux-gnueabi -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-ARM
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; RUN: llc < %s -mtriple=thumb-linux-gnueabi -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-THUMB
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; RUN: llc < %s -mtriple=armv7-linux-gnueabi -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-ARMV7
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; RUN: llc < %s -mtriple=thumbv7-linux-gnueabi -verify-machineinstrs | FileCheck %s -check-prefix=CHECK-THUMBV7
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define zeroext i1 @test_cmpxchg_res_i8(i8* %addr, i8 %desired, i8 zeroext %new) {
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entry:
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%0 = cmpxchg i8* %addr, i8 %desired, i8 %new monotonic monotonic
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%1 = extractvalue { i8, i1 } %0, 1
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ret i1 %1
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}
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; CHECK-ARM-LABEL: test_cmpxchg_res_i8
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; CHECK-ARM: bl __sync_val_compare_and_swap_1
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; CHECK-ARM: mov [[REG:r[0-9]+]], #0
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; CHECK-ARM: cmp r0, {{r[0-9]+}}
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; CHECK-ARM: moveq [[REG]], #1
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; CHECK-ARM: mov r0, [[REG]]
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; CHECK-THUMB-LABEL: test_cmpxchg_res_i8
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; CHECK-THUMB: bl __sync_val_compare_and_swap_1
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; CHECK-THUMB-NOT: mov [[R1:r[0-7]]], r0
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; CHECK-THUMB: push {r0}
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; CHECK-THUMB: pop {[[R1:r[0-7]]]}
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; CHECK-THUMB: movs r0, #1
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; CHECK-THUMB: movs [[R2:r[0-9]+]], #0
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; CHECK-THUMB: cmp [[R1]], {{r[0-9]+}}
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; CHECK-THU<B: beq
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; CHECK-THUMB: push {[[R2]]}
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; CHECK-THUMB: pop {r0}
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; CHECK-ARMV7-LABEL: test_cmpxchg_res_i8
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; CHECK-ARMV7: ldrexb [[R3:r[0-9]+]], [r0]
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; CHECK-ARMV7: mov [[R1:r[0-9]+]], #0
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; CHECK-ARMV7: cmp [[R3]], {{r[0-9]+}}
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; CHECK-ARMV7: bne
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; CHECK-ARMV7: strexb [[R3]], {{r[0-9]+}}, [{{r[0-9]+}}]
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; CHECK-ARMV7: mov [[R1]], #1
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; CHECK-ARMV7: cmp [[R3]], #0
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; CHECK-ARMV7: bne
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; CHECK-ARMV7: mov r0, [[R1]]
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; CHECK-THUMBV7-LABEL: test_cmpxchg_res_i8
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; CHECK-THUMBV7: ldrexb [[R3:r[0-9]+]], [r0]
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; CHECK-THUMBV7: cmp [[R3]], {{r[0-9]+}}
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; CHECK-THUMBV7: movne r0, #0
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; CHECK-THUMBV7: bxne lr
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; CHECK-THUMBV7: strexb [[R3]], {{r[0-9]+}}, [{{r[0-9]+}}]
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; CHECK-THUMBV7: cmp [[R3]], #0
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; CHECK-THUMBV7: itt eq
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; CHECK-THUMBV7: moveq r0, #1
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; CHECK-THUMBV7: bxeq lr
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