mirror of
https://github.com/RPCS3/llvm.git
synced 2026-07-22 03:35:35 -04:00
Sanjay Patel
a3209ae52e
If we have an AssertZext of a truncated value that has already been AssertZext'ed, we can assert on the wider source op to improve the zext-y knowledge: assert (trunc (assert X, i8) to iN), i1 --> trunc (assert X, i1) to iN This moves a fold from being Mips-specific to general combining, and x86 shows improvements. Differential Revision: https://reviews.llvm.org/D37017 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313577 91177308-0d34-0410-b5e6-96231b3b80d8
63 lines
1.6 KiB
LLVM
63 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s -check-prefix=X32
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s -check-prefix=X64
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; It's not necessary to zero-extend the arg because it is specified 'zeroext'.
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define void @bar1(i1 zeroext %v1) nounwind ssp {
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; X32-LABEL: bar1:
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; X32: # BB#0:
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; X32-NEXT: movzbl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: pushl %eax
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; X32-NEXT: calll foo1
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; X32-NEXT: addl $4, %esp
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; X32-NEXT: retl
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;
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; X64-LABEL: bar1:
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; X64: # BB#0:
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: jmp foo1 # TAILCALL
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%conv = zext i1 %v1 to i32
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%call = tail call i32 (...) @foo1(i32 %conv) nounwind
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ret void
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}
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; Check that on x86-64 the arguments are simply forwarded.
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define void @bar2(i8 zeroext %v1) nounwind ssp {
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; X32-LABEL: bar2:
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; X32: # BB#0:
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; X32-NEXT: movzbl {{[0-9]+}}(%esp), %eax
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; X32-NEXT: pushl %eax
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; X32-NEXT: calll foo1
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; X32-NEXT: addl $4, %esp
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; X32-NEXT: retl
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;
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; X64-LABEL: bar2:
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; X64: # BB#0:
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: jmp foo1 # TAILCALL
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%conv = zext i8 %v1 to i32
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%call = tail call i32 (...) @foo1(i32 %conv) nounwind
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ret void
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}
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; Check that i1 return values are not zero-extended.
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define zeroext i1 @bar3() nounwind ssp {
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; X32-LABEL: bar3:
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; X32: # BB#0:
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; X32-NEXT: calll foo2
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; X32-NEXT: retl
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;
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; X64-LABEL: bar3:
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; X64: # BB#0:
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; X64-NEXT: pushq %rax
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; X64-NEXT: callq foo2
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; X64-NEXT: popq %rcx
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; X64-NEXT: retq
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%call = call i1 @foo2() nounwind
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ret i1 %call
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}
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declare i32 @foo1(...)
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declare zeroext i1 @foo2()
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