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8e9e490391
This patch modifies the indirect call promotion utilities by exposing and using an unconditional call promotion interface. The unconditional promotion interface (i.e., call promotion without creating an if-then-else) can be used if it's known that an indirect call has only one possible callee. The existing conditional promotion interface uses this unconditional interface to promote an indirect call after it has been versioned and placed within the "then" block. A consequence of unconditional promotion is that the fix-up operations for phi nodes in the normal destination of invoke instructions are changed. This is necessary because the existing implementation assumed that an invoke had been versioned, creating a "merge" block where a return value bitcast could be placed. In the new implementation, the edge between a promoted invoke's parent block and its normal destination is split if needed to add a bitcast for the return value. If the invoke is also versioned, the phi node merging the return value of the promoted and original invoke instructions is placed in the "merge" block. Differential Revision: https://reviews.llvm.org/D40751 llvm-svn: 321210
34 lines
1.4 KiB
LLVM
34 lines
1.4 KiB
LLVM
; RUN: opt < %s -pgo-icall-prom -S | FileCheck %s --check-prefix=ICALL-PROM
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; RUN: opt < %s -passes=pgo-icall-prom -S | FileCheck %s --check-prefix=ICALL-PROM
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@foo = common global i32 (i32, ...)* null, align 8
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define i32 @va_func(i32 %num, ...) {
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entry:
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ret i32 0
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}
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define i32 @bar() #1 {
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entry:
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%tmp = load i32 (i32, ...)*, i32 (i32, ...)** @foo, align 8
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; ICALL-PROM: [[CMP:%[0-9]+]] = icmp eq i32 (i32, ...)* %tmp, @va_func
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; ICALL-PROM: br i1 [[CMP]], label %if.true.direct_targ, label %if.false.orig_indirect, !prof [[BRANCH_WEIGHT:![0-9]+]]
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; ICALL-PROM:if.true.direct_targ:
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; ICALL-PROM: [[DIRCALL_RET:%[0-9]+]] = call i32 (i32, ...) @va_func(i32 3, i32 12, i32 22, i32 4)
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; ICALL-PROM: br label %if.end.icp
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%call = call i32 (i32, ...) %tmp(i32 3, i32 12, i32 22, i32 4), !prof !1
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; ICALL-PROM:if.false.orig_indirect:
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; ICALL-PROM: %call = call i32 (i32, ...) %tmp(i32 3, i32 12, i32 22, i32 4)
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; ICALL-PROM: br label %if.end.icp
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ret i32 %call
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; ICALL-PROM:if.end.icp:
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; ICALL-PROM: [[PHI_RET:%[0-9]+]] = phi i32 [ %call, %if.false.orig_indirect ], [ [[DIRCALL_RET]], %if.true.direct_targ ]
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; ICALL-PROM: ret i32 [[PHI_RET]]
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}
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!1 = !{!"VP", i32 0, i64 12345, i64 989055279648259519, i64 12345}
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; ICALL-PROM: [[BRANCH_WEIGHT]] = !{!"branch_weights", i32 12345, i32 0}
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