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1f6e565a78
Instead of always using addu to adjust the stack pointer when the size out is of the range of an addiu instruction, use subu so that a smaller constant can be generated. This can give savings of ~3 instructions whenever a function has a a stack frame whose size is out of range of an addiu instruction. This change may break some naive stack unwinders. Partially resolves PR/26291. Thanks to David Chisnall for reporting the issue. Reviewers: dsanders, vkalintiris Differential Review: http://reviews.llvm.org/D21321 llvm-svn: 272666
37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
LLVM
; RUN: llc -march=mipsel -relocation-model=pic < %s | FileCheck %s -check-prefix=32
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; RUN: llc -march=mips64el -mcpu=mips4 -target-abi=n64 -relocation-model=pic < %s | \
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; RUN: FileCheck %s -check-prefix=64
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; RUN: llc -march=mips64el -mcpu=mips64 -target-abi=n64 -relocation-model=pic < %s | \
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; RUN: FileCheck %s -check-prefix=64
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%struct.S1 = type { [65536 x i8] }
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@s1 = external global %struct.S1
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define void @f() nounwind {
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entry:
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; 32: lui $[[R0:[0-9]+]], 1
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; 32: addiu $[[R0]], $[[R0]], 24
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; 32: subu $sp, $sp, $[[R0]]
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; 32: lui $[[R1:[0-9]+]], 1
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; 32: addu $[[R1]], $sp, $[[R1]]
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; 32: sw $ra, 20($[[R1]])
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; 64: lui $[[R0:[0-9]+]], 1
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; 64: daddiu $[[R0]], $[[R0]], 32
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; 64: dsubu $sp, $sp, $[[R0]]
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; 64: lui $[[R1:[0-9]+]], 1
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; 64: daddu $[[R1]], $sp, $[[R1]]
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; 64: sd $ra, 24($[[R1]])
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%agg.tmp = alloca %struct.S1, align 1
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%tmp = getelementptr inbounds %struct.S1, %struct.S1* %agg.tmp, i32 0, i32 0, i32 0
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp, i8* getelementptr inbounds (%struct.S1, %struct.S1* @s1, i32 0, i32 0, i32 0), i32 65536, i32 1, i1 false)
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call void @f2(%struct.S1* byval %agg.tmp) nounwind
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ret void
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}
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declare void @f2(%struct.S1* byval)
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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