diff options
Diffstat (limited to 'gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch')
| -rw-r--r-- | gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch b/gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch new file mode 100644 index 0000000000..3f16de5a2b --- /dev/null +++ b/gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch @@ -0,0 +1,113 @@ +Guix note: this got detected with the test suite of rustc 1.41.1, but +the issue potentially affects all consumers of LLVM. + +From 58e8c793d0e43150a6452e971a32d7407a8a7401 Mon Sep 17 00:00:00 2001 +From: Tim Northover <tnorthover@apple.com> +Date: Mon, 30 Sep 2019 07:46:52 +0000 +Subject: [PATCH] Revert "[SCEV] add no wrap flag for SCEVAddExpr." + +This reverts r366419 because the analysis performed is within the context of +the loop and it's only valid to add wrapping flags to "global" expressions if +they're always correct. + +llvm-svn: 373184 +--- + llvm/lib/Analysis/ScalarEvolution.cpp | 2 +- + llvm/test/Analysis/ScalarEvolution/limit-depth.ll | 2 +- + llvm/test/Analysis/ScalarEvolution/nsw.ll | 2 +- + llvm/test/Analysis/ScalarEvolution/trip-count12.ll | 2 +- + llvm/test/Analysis/ScalarEvolution/trip-count9.ll | 8 ++++---- + 5 files changed, 8 insertions(+), 8 deletions(-) + +diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp +index 354ae05bb841..c29fc5dbccfb 100644 +--- a/llvm/lib/Analysis/ScalarEvolution.cpp ++++ b/llvm/lib/Analysis/ScalarEvolution.cpp +@@ -4992,7 +4992,7 @@ const SCEV *ScalarEvolution::createSimpleAffineAddRec(PHINode *PN, + // overflow. + if (auto *BEInst = dyn_cast<Instruction>(BEValueV)) + if (isLoopInvariant(Accum, L) && isAddRecNeverPoison(BEInst, L)) +- (void)getAddRecExpr(getAddExpr(StartVal, Accum, Flags), Accum, L, Flags); ++ (void)getAddRecExpr(getAddExpr(StartVal, Accum), Accum, L, Flags); + + return PHISCEV; + } +diff --git a/llvm/test/Analysis/ScalarEvolution/limit-depth.ll b/llvm/test/Analysis/ScalarEvolution/limit-depth.ll +index db68a4f84c91..6fdf8c5df974 100644 +--- a/llvm/test/Analysis/ScalarEvolution/limit-depth.ll ++++ b/llvm/test/Analysis/ScalarEvolution/limit-depth.ll +@@ -46,7 +46,7 @@ define void @test_mul(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) { + define void @test_sext(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) { + ; CHECK-LABEL: @test_sext + ; CHECK: %se2 = sext i64 %iv2.inc to i128 +-; CHECK-NEXT: --> {(1 + (sext i64 {(sext i32 (1 + %a)<nsw> to i64),+,1}<nsw><%loop> to i128))<nsw>,+,1}<nsw><%loop2> ++; CHECK-NEXT: --> {(1 + (sext i64 {(sext i32 (1 + %a) to i64),+,1}<nsw><%loop> to i128))<nsw>,+,1}<nsw><%loop2> + entry: + br label %loop + +diff --git a/llvm/test/Analysis/ScalarEvolution/nsw.ll b/llvm/test/Analysis/ScalarEvolution/nsw.ll +index 69427368625d..ca24f9d4a04b 100644 +--- a/llvm/test/Analysis/ScalarEvolution/nsw.ll ++++ b/llvm/test/Analysis/ScalarEvolution/nsw.ll +@@ -163,7 +163,7 @@ bb5: ; preds = %bb2 + declare void @f(i32) + + ; CHECK-LABEL: nswnowrap +-; CHECK: --> {(1 + %v)<nsw>,+,1}<nsw><%for.body>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (2 + %v) ++; CHECK: --> {(1 + %v)<nsw>,+,1}<nsw><%for.body>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (1 + ((1 + %v)<nsw> smax %v)) + define void @nswnowrap(i32 %v, i32* %buf) { + entry: + %add = add nsw i32 %v, 1 +diff --git a/llvm/test/Analysis/ScalarEvolution/trip-count12.ll b/llvm/test/Analysis/ScalarEvolution/trip-count12.ll +index 5e7d72d5e4f3..d0086ee2e6ac 100644 +--- a/llvm/test/Analysis/ScalarEvolution/trip-count12.ll ++++ b/llvm/test/Analysis/ScalarEvolution/trip-count12.ll +@@ -1,7 +1,7 @@ + ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s + + ; CHECK: Determining loop execution counts for: @test +-; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len)<nsw> /u 2) ++; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2) + ; CHECK: Loop %for.body: max backedge-taken count is 1073741823 + + define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly { +diff --git a/llvm/test/Analysis/ScalarEvolution/trip-count9.ll b/llvm/test/Analysis/ScalarEvolution/trip-count9.ll +index c0a1d12fa00e..9a080b34743f 100644 +--- a/llvm/test/Analysis/ScalarEvolution/trip-count9.ll ++++ b/llvm/test/Analysis/ScalarEvolution/trip-count9.ll +@@ -179,7 +179,7 @@ exit: + } + + ; CHECK: Determining loop execution counts for: @nsw_startx +-; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x)<nsw> smax %n)) ++; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x) smax %n)) + ; CHECK: Loop %loop: max backedge-taken count is -1 + define void @nsw_startx(i4 %n, i4 %x) { + entry: +@@ -195,7 +195,7 @@ exit: + } + + ; CHECK: Determining loop execution counts for: @nsw_startx_step2 +-; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x)<nsw> smax %n)) /u 2) ++; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x) smax %n)) /u 2) + ; CHECK: Loop %loop: max backedge-taken count is 7 + define void @nsw_startx_step2(i4 %n, i4 %x) { + entry: +@@ -381,7 +381,7 @@ exit: + } + + ; CHECK: Determining loop execution counts for: @even_nsw_startx +-; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x)<nsw> smax (2 * %n))) ++; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x) smax (2 * %n))) + ; CHECK: Loop %loop: max backedge-taken count is -2 + define void @even_nsw_startx(i4 %n, i4 %x) { + entry: +@@ -398,7 +398,7 @@ exit: + } + + ; CHECK: Determining loop execution counts for: @even_nsw_startx_step2 +-; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x)<nsw> smax (2 * %n))) /u 2) ++; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x) smax (2 * %n))) /u 2) + ; CHECK: Loop %loop: max backedge-taken count is 7 + define void @even_nsw_startx_step2(i4 %n, i4 %x) { + entry: |