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[GVN] Perform Scalar PRE on gep indices that feed loads before doing Load PRE.

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Phabricator Revision: http://reviews.llvm.org/D6103
Patch by "Balaram Makam" <bmakam@codeaurora.org>!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2014-11-13 21:17:58 +00:00
parent add7c56be5
commit a9cc4e7e35
2 changed files with 219 additions and 170 deletions
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49
test/Transforms/GVN/pre-gep-load.ll Normal file
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; RUN: opt < %s -basicaa -gvn -enable-load-pre -S | FileCheck %s
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnu"
define double @foo(i32 %stat, i32 %i, double** %p) {
; CHECK-LABEL: @foo(
entry:
switch i32 %stat, label %sw.default [
i32 0, label %sw.bb
i32 1, label %sw.bb
i32 2, label %sw.bb2
]
sw.bb: ; preds = %entry, %entry
%idxprom = sext i32 %i to i64
%arrayidx = getelementptr inbounds double** %p, i64 0
%0 = load double** %arrayidx, align 8
%arrayidx1 = getelementptr inbounds double* %0, i64 %idxprom
%1 = load double* %arrayidx1, align 8
%sub = fsub double %1, 1.000000e+00
%cmp = fcmp olt double %sub, 0.000000e+00
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %sw.bb
br label %return
if.end: ; preds = %sw.bb
br label %sw.bb2
sw.bb2: ; preds = %if.end, %entry
%idxprom3 = sext i32 %i to i64
%arrayidx4 = getelementptr inbounds double** %p, i64 0
%2 = load double** %arrayidx4, align 8
%arrayidx5 = getelementptr inbounds double* %2, i64 %idxprom3
%3 = load double* %arrayidx5, align 8
; CHECK: sw.bb2:
; CHECK-NEXT-NOT: sext
; CHECK-NEXT: phi double [
; CHECK-NOT: load
%sub6 = fsub double 3.000000e+00, %3
br label %return
sw.default: ; preds = %entry
br label %return
return: ; preds = %sw.default, %sw.bb2, %if.then
%retval.0 = phi double [ 0.000000e+00, %sw.default ], [ %sub6, %sw.bb2 ], [ %sub, %if.then ]
ret double %retval.0
}