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[X86] Add test add with bit0 extraction and improve comments 

Based on feedback from D122084
This commit is contained in:
Simon Pilgrim 2022-03-20 09:31:52 +00:00
parent 1ae3c4e948
commit 06fa67dc0a
1 changed files with 29 additions and 3 deletions
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32
llvm/test/CodeGen/X86/add-sub-bool.ll
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@ -3,10 +3,12 @@
; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s --check-prefixes=X64,NOTBM ; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s --check-prefixes=X64,NOTBM
; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+tbm | FileCheck %s --check-prefixes=X64,TBM ; RUN: llc < %s -mtriple=x86_64-unknown -mattr=+tbm | FileCheck %s --check-prefixes=X64,TBM
; PR35908 - Fold ADD/SUB and bit tests into ADC/SBB+BT ; PR35908 - Fold ADD/SUB and bit extracts into ADC/SBB+BT
; ;
; int test_add(int x, int y, int z) { return (bool(z & (1 << 30)) + x + y); } ; int test_add_add(int x, int y, int z) { return ((x + y) + bool(z & (1 << 30))); }
; int test_sub(int x, int y, int z) { return (bool(z & (1 << 30)) - x - y); } ; int test_add_sub(int x, int y, int z) { return ((x - y) + bool(z & (1 << 30))); }
; int test_sub_add(int x, int y, int z) { return ((x + y) - bool(z & (1 << 30))); }
; int test_sub_sub(int x, int y, int z) { return (x - (y - bool(z & (1 << 30)))); }
; ;
; Constant Bit Indices ; Constant Bit Indices
@ -84,6 +86,30 @@ define i32 @test_i32_add_add_commute_idx(i32 %x, i32 %y, i32 %z) {
ret i32 %add1 ret i32 %add1
} }
define i32 @test_i32_add_add_idx0(i32 %x, i32 %y, i32 %z) {
; X86-LABEL: test_i32_add_add_idx0:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: addl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: andl $1, %eax
; X86-NEXT: addl %ecx, %eax
; X86-NEXT: retl
;
; X64-LABEL: test_i32_add_add_idx0:
; X64: # %bb.0:
; X64-NEXT: # kill: def $esi killed $esi def $rsi
; X64-NEXT: # kill: def $edi killed $edi def $rdi
; X64-NEXT: leal (%rdi,%rsi), %eax
; X64-NEXT: andl $1, %edx
; X64-NEXT: addl %edx, %eax
; X64-NEXT: retq
%add = add i32 %y, %x
%mask = and i32 %z, 1
%add1 = add i32 %mask, %add
ret i32 %add1
}
define i32 @test_i32_add_sub_idx(i32 %x, i32 %y, i32 %z) { define i32 @test_i32_add_sub_idx(i32 %x, i32 %y, i32 %z) {
; X86-LABEL: test_i32_add_sub_idx: ; X86-LABEL: test_i32_add_sub_idx:
; X86: # %bb.0: ; X86: # %bb.0: