Enhance logic in X86DAGToDAGISel::PreprocessForRMW which move load inside callseq_start to allow it to be folded into a call. It was not considering the cases where a token factor is between the load and the callseq_start.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63022 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 45 insertions, 0 deletions

diff --git a/test/CodeGen/X86/fold-call-3.ll b/test/CodeGen/X86/fold-call-3.ll
new file mode 100644
index 0000000..824ae00
--- /dev/null
+++ b/test/CodeGen/X86/fold-call-3.ll
@@ -0,0 +1,45 @@
+; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin | grep call | grep 560
+; rdar://6522427
+
+	%"struct.clang::Action" = type { %"struct.clang::ActionBase" }
+	%"struct.clang::ActionBase" = type { i32 (...)** }
+	%"struct.clang::ActionBase::ActionResult<0u>" = type { i8*, i8 }
+@NumTrials = internal global i32 10000000		; <i32*> [#uses=2]
+@llvm.used = appending global [1 x i8*] [ i8* bitcast (void (i8*, %"struct.clang::Action"*)* @_Z25RawPointerPerformanceTestPvRN5clang6ActionE to i8*) ], section "llvm.metadata"		; <[1 x i8*]*> [#uses=0]
+
+define void @_Z25RawPointerPerformanceTestPvRN5clang6ActionE(i8* %Val, %"struct.clang::Action"* %Actions) nounwind {
+entry:
+	%0 = alloca %"struct.clang::ActionBase::ActionResult<0u>", align 8		; <%"struct.clang::ActionBase::ActionResult<0u>"*> [#uses=3]
+	%1 = load i32* @NumTrials, align 4		; <i32> [#uses=1]
+	%2 = icmp eq i32 %1, 0		; <i1> [#uses=1]
+	br i1 %2, label %return, label %bb.nph
+
+bb.nph:		; preds = %entry
+	%3 = getelementptr %"struct.clang::Action"* %Actions, i64 0, i32 0, i32 0		; <i32 (...)***> [#uses=1]
+	%mrv_gep = bitcast %"struct.clang::ActionBase::ActionResult<0u>"* %0 to i64*		; <i64*> [#uses=1]
+	%mrv_gep1 = getelementptr %"struct.clang::ActionBase::ActionResult<0u>"* %0, i64 0, i32 1		; <i8*> [#uses=1]
+	%4 = bitcast i8* %mrv_gep1 to i64*		; <i64*> [#uses=1]
+	%5 = getelementptr %"struct.clang::ActionBase::ActionResult<0u>"* %0, i64 0, i32 0		; <i8**> [#uses=1]
+	br label %bb
+
+bb:		; preds = %bb, %bb.nph
+	%Trial.01 = phi i32 [ 0, %bb.nph ], [ %12, %bb ]		; <i32> [#uses=1]
+	%Val_addr.02 = phi i8* [ %Val, %bb.nph ], [ %11, %bb ]		; <i8*> [#uses=1]
+	%6 = load i32 (...)*** %3, align 8		; <i32 (...)**> [#uses=1]
+	%7 = getelementptr i32 (...)** %6, i64 70		; <i32 (...)**> [#uses=1]
+	%8 = load i32 (...)** %7, align 8		; <i32 (...)*> [#uses=1]
+	%9 = bitcast i32 (...)* %8 to { i64, i64 } (%"struct.clang::Action"*, i8*)*		; <{ i64, i64 } (%"struct.clang::Action"*, i8*)*> [#uses=1]
+	%10 = call { i64, i64 } %9(%"struct.clang::Action"* %Actions, i8* %Val_addr.02) nounwind		; <{ i64, i64 }> [#uses=2]
+	%mrv_gr = extractvalue { i64, i64 } %10, 0		; <i64> [#uses=1]
+	store i64 %mrv_gr, i64* %mrv_gep
+	%mrv_gr2 = extractvalue { i64, i64 } %10, 1		; <i64> [#uses=1]
+	store i64 %mrv_gr2, i64* %4
+	%11 = load i8** %5, align 8		; <i8*> [#uses=1]
+	%12 = add i32 %Trial.01, 1		; <i32> [#uses=2]
+	%13 = load i32* @NumTrials, align 4		; <i32> [#uses=1]
+	%14 = icmp ult i32 %12, %13		; <i1> [#uses=1]
+	br i1 %14, label %bb, label %return
+
+return:		; preds = %bb, %entry
+	ret void
+}