forked from OSchip/llvm-project
[X86] Add test add with bit0 extraction and improve comments
Based on feedback from D122084
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@ -3,10 +3,12 @@
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; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s --check-prefixes=X64,NOTBM
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; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+tbm | FileCheck %s --check-prefixes=X64,TBM
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; PR35908 - Fold ADD/SUB and bit tests into ADC/SBB+BT
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; PR35908 - Fold ADD/SUB and bit extracts into ADC/SBB+BT
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;
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; int test_add(int x, int y, int z) { return (bool(z & (1 << 30)) + x + y); }
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; int test_sub(int x, int y, int z) { return (bool(z & (1 << 30)) - x - y); }
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; int test_add_add(int x, int y, int z) { return ((x + y) + bool(z & (1 << 30))); }
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; int test_add_sub(int x, int y, int z) { return ((x - y) + bool(z & (1 << 30))); }
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; int test_sub_add(int x, int y, int z) { return ((x + y) - bool(z & (1 << 30))); }
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; int test_sub_sub(int x, int y, int z) { return (x - (y - bool(z & (1 << 30)))); }
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;
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; Constant Bit Indices
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@ -84,6 +86,30 @@ define i32 @test_i32_add_add_commute_idx(i32 %x, i32 %y, i32 %z) {
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ret i32 %add1
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}
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define i32 @test_i32_add_add_idx0(i32 %x, i32 %y, i32 %z) {
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; X86-LABEL: test_i32_add_add_idx0:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: addl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: andl $1, %eax
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; X86-NEXT: addl %ecx, %eax
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; X86-NEXT: retl
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;
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; X64-LABEL: test_i32_add_add_idx0:
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; X64: # %bb.0:
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; X64-NEXT: # kill: def $esi killed $esi def $rsi
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; X64-NEXT: # kill: def $edi killed $edi def $rdi
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; X64-NEXT: leal (%rdi,%rsi), %eax
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; X64-NEXT: andl $1, %edx
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; X64-NEXT: addl %edx, %eax
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; X64-NEXT: retq
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%add = add i32 %y, %x
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%mask = and i32 %z, 1
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%add1 = add i32 %mask, %add
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ret i32 %add1
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}
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define i32 @test_i32_add_sub_idx(i32 %x, i32 %y, i32 %z) {
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; X86-LABEL: test_i32_add_sub_idx:
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; X86: # %bb.0:
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