derek.holloway
7502bf64a4
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48 lines
1.5 KiB
LLVM
48 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s --check-prefix=X64
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; RUN: llc < %s -mtriple=i686-unknown-linux-gnu | FileCheck %s --check-prefix=X86
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; Regression tests for the (zext (and (trunc x) C)) -> (and x C) fold in
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; visitZERO_EXTEND (and symmetrically in visitANY_EXTEND). On X86,
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; isTruncateFree(i32->i8) is true but isZExtFree(i8->i32) is false, so the
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; fold fires to avoid redundant narrow-AND + movzx sequences.
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; Basic (zext (and (trunc i32) C)) -> (and i32 C) pattern.
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define i32 @zext_and_trunc_i32(i32 %x) {
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; X64-LABEL: zext_and_trunc_i32:
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; X64: # %bb.0:
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; X64-NEXT: movl %edi, %eax
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; X64-NEXT: andl $7, %eax
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; X64-NEXT: retq
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;
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; X86-LABEL: zext_and_trunc_i32:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: andl $7, %eax
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; X86-NEXT: retl
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%trunc = trunc i32 %x to i8
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%and = and i8 %trunc, 7
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%zext = zext i8 %and to i32
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ret i32 %zext
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}
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; (zext (and (trunc i64) C)) -> (and i32 C) on x86-64.
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define i32 @zext_and_trunc_i64(i64 %x) {
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; X64-LABEL: zext_and_trunc_i64:
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; X64: # %bb.0:
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; X64-NEXT: movq %rdi, %rax
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; X64-NEXT: andl $15, %eax
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; X64-NEXT: # kill: def $eax killed $eax killed $rax
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; X64-NEXT: retq
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;
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; X86-LABEL: zext_and_trunc_i64:
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; X86: # %bb.0:
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: andl $15, %eax
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; X86-NEXT: retl
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%trunc = trunc i64 %x to i8
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%and = and i8 %trunc, 15
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%zext = zext i8 %and to i32
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ret i32 %zext
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}
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