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f329765d23
If we have an add (or an or that is really an add), where one operand is a
FrameIndex and the other operand is a small constant, we can combine the
lowering of the FrameIndex (which is lowered as an add of the FI and a zero
offset) with the constant operand.
Amusingly, this is an old potential improvement entry from
lib/Target/PowerPC/README.txt which had never been resolved. In short, we used
to lower:
%X = alloca { i32, i32 }
%Y = getelementptr {i32,i32}* %X, i32 0, i32 1
ret i32* %Y
as:
addi 3, 1, -8
ori 3, 3, 4
blr
and now we produce:
addi 3, 1, -4
blr
which is much more sensible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224071 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
573 B
LLVM
21 lines
573 B
LLVM
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; RUN: llc < %s | FileCheck %s
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define i32 @intvaarg(i32 %a, ...) nounwind {
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entry:
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%va = alloca i8*, align 8
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%va1 = bitcast i8** %va to i8*
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call void @llvm.va_start(i8* %va1)
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%0 = va_arg i8** %va, i32
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%sub = sub nsw i32 %a, %0
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ret i32 %sub
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}
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declare void @llvm.va_start(i8*) nounwind
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; CHECK: @intvaarg
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; Make sure that the va pointer is incremented by 8 (not 4).
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; CHECK: addi{{.*}}, 1, 64
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