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https://github.com/c64scene-ar/llvm-6502.git
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9ae5b7a40a
This initial implementation of PPCTargetLowering::isZExtFree marks as free zexts of small scalar loads (that are not sign-extending). This callback is used by SelectionDAGBuilder's RegsForValue::getCopyToRegs, and thus to determine whether a zext or an anyext is used to lower illegally-typed PHIs. Because later truncates of zero-extended values are nops, this allows for the elimination of later unnecessary truncations. Fixes the initial complaint associated with PR22120. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225584 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; RUN: llc -mcpu=ppc64 < %s | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; Function Attrs: noreturn nounwind
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define signext i32 @_Z1fRPc(i8** nocapture dereferenceable(8) %p) #0 {
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entry:
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%.pre = load i8** %p, align 8
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br label %loop
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loop: ; preds = %loop.backedge, %entry
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%0 = phi i8* [ %.pre, %entry ], [ %.be, %loop.backedge ]
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%1 = load i8* %0, align 1
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%tobool = icmp eq i8 %1, 0
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%incdec.ptr = getelementptr inbounds i8* %0, i64 1
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store i8* %incdec.ptr, i8** %p, align 8
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%2 = load i8* %incdec.ptr, align 1
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%tobool2 = icmp ne i8 %2, 0
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%or.cond = and i1 %tobool, %tobool2
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br i1 %or.cond, label %if.then3, label %loop.backedge
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if.then3: ; preds = %loop
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%incdec.ptr4 = getelementptr inbounds i8* %0, i64 2
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store i8* %incdec.ptr4, i8** %p, align 8
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br label %loop.backedge
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loop.backedge: ; preds = %if.then3, %loop
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%.be = phi i8* [ %incdec.ptr4, %if.then3 ], [ %incdec.ptr, %loop ]
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br label %loop
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; CHECK-LABEL: @_Z1fRPc
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; CHECK-NOT: rlwinm {{[0-9]+}}, {{[0-9]+}}, 0, 24, 31
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; CHECK-NOT: clrlwi {{[0-9]+}}, {{[0-9]+}}, 24
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}
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attributes #0 = { noreturn nounwind }
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