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d3a601b06b
This re-applies r293343 (reverts commit r293475) with a fix for an assertion failure caused by a missing integer cast. I tested this patch by using the built compiler to compile X86FastISel.cpp.o with ubsan. Original commit message: Ubsan does not report UB shifts in some cases where the shift exponent needs to be truncated to match the type of the shift base. We perform a range check on the truncated shift amount, leading to false negatives. Fix the issue (PR27271) by performing the range check on the original shift amount. Differential Revision: https://reviews.llvm.org/D29234 llvm-svn: 293572
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
// RUN: %clang_cc1 -triple=x86_64-apple-darwin -fsanitize=shift-exponent,shift-base -emit-llvm %s -o - | FileCheck %s
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// CHECK-LABEL: define i32 @f1
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int f1(int c, int shamt) {
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// CHECK: icmp ule i32 %{{.*}}, 31, !nosanitize
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// CHECK: icmp ule i32 %{{.*}}, 31, !nosanitize
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return 1 << (c << shamt);
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}
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// CHECK-LABEL: define i32 @f2
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int f2(long c, int shamt) {
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// CHECK: icmp ule i32 %{{.*}}, 63, !nosanitize
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// CHECK: icmp ule i64 %{{.*}}, 31, !nosanitize
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return 1 << (c << shamt);
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}
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// CHECK-LABEL: define i32 @f3
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unsigned f3(unsigned c, int shamt) {
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// CHECK: icmp ule i32 %{{.*}}, 31, !nosanitize
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// CHECK: icmp ule i32 %{{.*}}, 31, !nosanitize
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return 1U << (c << shamt);
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}
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// CHECK-LABEL: define i32 @f4
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unsigned f4(unsigned long c, int shamt) {
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// CHECK: icmp ule i32 %{{.*}}, 63, !nosanitize
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// CHECK: icmp ule i64 %{{.*}}, 31, !nosanitize
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return 1U << (c << shamt);
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}
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// CHECK-LABEL: define i32 @f5
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int f5(int c, long long shamt) {
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// CHECK: icmp ule i64 %{{[0-9]+}}, 31, !nosanitize
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//
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// CHECK: sub nuw nsw i32 31, %sh_prom, !nosanitize
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// CHECK: lshr i32 %{{.*}}, %shl.zeros, !nosanitize
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return c << shamt;
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}
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// CHECK-LABEL: define i32 @f6
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int f6(int c, int shamt) {
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// CHECK: icmp ule i32 %[[WIDTH:.*]], 31, !nosanitize
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//
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// CHECK: sub nuw nsw i32 31, %[[WIDTH]], !nosanitize
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// CHECK: lshr i32 %{{.*}}, %shl.zeros, !nosanitize
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return c << shamt;
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}
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