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d48111840e
Reapply r226071 with fixes. Two fixes:
1. We need to manually remove the old and create the new 'deaf defs'
associated with physical register definitions when we move the definition of
the physical register from the copy point to the point of the original vreg def.
This problem was picked up by the machinstr verifier, and could trigger a
verification failure on test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll, so I've
turned on the verifier in the tests.
2. When moving the def point of the phys reg up, we need to make sure that it
is neither defined nor read in between the two instructions. We don't, however,
extend the live ranges of phys reg defs to cover uses, so just checking for
live-range overlap between the pair interval and the phys reg aliases won't
pick up reads. As a result, we manually iterate over the range and check for
reads.
A test soon to be committed to the PowerPC backend will test this change.
Original commit message:
[RegisterCoalescer] Remove copies to reserved registers
This allows the RegisterCoalescer to join "non-flipped" range pairs with a
physical destination register -- which allows the RegisterCoalescer to remove
copies like this:
<vreg> = something (maybe a load, for example)
... (things that don't use PHYSREG)
PHYSREG = COPY <vreg>
(with all of the restrictions normally applied by the RegisterCoalescer: having
compatible register classes, etc. )
Previously, the RegisterCoalescer handled only the opposite case (copying
*from* a physical register). I don't handle the problem fully here, but try to
get the common case where there is only one use of <vreg> (the COPY).
An upcoming commit to the PowerPC backend will make this pattern much more
common on PPC64/ELF systems.
llvm-svn: 226200
69 lines
2.2 KiB
LLVM
69 lines
2.2 KiB
LLVM
; RUN: llc -mcpu=generic -mtriple=arm-eabi -verify-machineinstrs < %s | FileCheck %s
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%struct.comment = type { i8**, i32*, i32, i8* }
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%struct.info = type { i32, i32, i32, i32, i32, i32, i32, i8* }
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%struct.state = type { i32, %struct.info*, float**, i32, i32, i32, i32, i32, i32, i32, i32, i32, i64, i64, i64, i64, i64, i64, i8* }
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@str215 = external global [2 x i8]
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define void @t1(%struct.state* %v) {
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; Make sure we generate:
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; sub sp, sp, r1
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; instead of:
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; sub r1, sp, r1
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; mov sp, r1
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; CHECK-LABEL: @t1
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; CHECK: bic [[REG1:r[0-9]+]],
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; CHECK-NOT: sub r{{[0-9]+}}, sp, [[REG1]]
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; CHECK: sub sp, sp, [[REG1]]
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%tmp6 = load i32* null
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%tmp8 = alloca float, i32 %tmp6
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store i32 1, i32* null
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br i1 false, label %bb123.preheader, label %return
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bb123.preheader: ; preds = %0
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br i1 false, label %bb43, label %return
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bb43: ; preds = %bb123.preheader
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call fastcc void @f1(float* %tmp8, float* null, i32 0)
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%tmp70 = load i32* null
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%tmp85 = getelementptr float* %tmp8, i32 0
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call fastcc void @f2(float* null, float* null, float* %tmp85, i32 %tmp70)
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ret void
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return: ; preds = %bb123.preheader, %0
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ret void
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}
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declare fastcc void @f1(float*, float*, i32)
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declare fastcc void @f2(float*, float*, float*, i32)
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define void @t2(%struct.comment* %vc, i8* %tag, i8* %contents) {
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%tmp1 = call i32 @strlen(i8* %tag)
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%tmp3 = call i32 @strlen(i8* %contents)
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%tmp4 = add i32 %tmp1, 2
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%tmp5 = add i32 %tmp4, %tmp3
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%tmp6 = alloca i8, i32 %tmp5
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%tmp9 = call i8* @strcpy(i8* %tmp6, i8* %tag)
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%tmp6.len = call i32 @strlen(i8* %tmp6)
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%tmp6.indexed = getelementptr i8* %tmp6, i32 %tmp6.len
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %tmp6.indexed, i8* getelementptr inbounds ([2 x i8]* @str215, i32 0, i32 0), i32 2, i32 1, i1 false)
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%tmp15 = call i8* @strcat(i8* %tmp6, i8* %contents)
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call fastcc void @comment_add(%struct.comment* %vc, i8* %tmp6)
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ret void
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}
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declare i32 @strlen(i8*)
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declare i8* @strcat(i8*, i8*)
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declare fastcc void @comment_add(%struct.comment*, i8*)
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declare i8* @strcpy(i8*, i8*)
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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