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TheRock/compiler/amd-llvm/llvm/test/CodeGen/X86/2006-05-08-CoalesceSubRegClass.ll
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derek.holloway 7502bf64a4
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2026-09-02 16:34:47 -07:00

35 lines
1.2 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; Coalescing from R32 to a subset R32_. Once another register coalescer bug is
; fixed, the movb should go away as well.
; RUN: llc < %s -mtriple=i686-- -relocation-model=static | FileCheck %s
@B = external dso_local global i32 ; <ptr> [#uses=2]
@C = external dso_local global ptr ; <ptr> [#uses=2]
define void @test(i32 %A) {
; CHECK-LABEL: test:
; CHECK: # %bb.0:
; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
; CHECK-NEXT: movl %eax, %ecx
; CHECK-NEXT: andb $16, %cl
; CHECK-NEXT: shll %cl, B
; CHECK-NEXT: shrl $3, %eax
; CHECK-NEXT: addl %eax, C
; CHECK-NEXT: retl
%A.upgrd.1 = trunc i32 %A to i8 ; <i8> [#uses=1]
%tmp2 = load i32, ptr @B ; <i32> [#uses=1]
%tmp3 = and i8 %A.upgrd.1, 16 ; <i8> [#uses=1]
%shift.upgrd.2 = zext i8 %tmp3 to i32 ; <i32> [#uses=1]
%tmp4 = shl i32 %tmp2, %shift.upgrd.2 ; <i32> [#uses=1]
store i32 %tmp4, ptr @B
%tmp6 = lshr i32 %A, 3 ; <i32> [#uses=1]
%tmp = load ptr, ptr @C ; <ptr> [#uses=1]
%tmp8 = ptrtoint ptr %tmp to i32 ; <i32> [#uses=1]
%tmp9 = add i32 %tmp8, %tmp6 ; <i32> [#uses=1]
%tmp9.upgrd.3 = inttoptr i32 %tmp9 to ptr ; <ptr> [#uses=1]
store ptr %tmp9.upgrd.3, ptr @C
ret void
}