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https://github.com/capstone-engine/llvm-capstone.git
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0d8b864829
instcombine will combine neg+icmp+select to llvm.abs.*. Let's just emit llvm.abs.* in the first place.
45 lines
2.1 KiB
C
45 lines
2.1 KiB
C
// RUN: %clang_cc1 -triple x86_64 -emit-llvm %s -o - -fwrapv -fsanitize=signed-integer-overflow | FileCheck %s --check-prefix=WRAPV
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm %s -o - -ftrapv | FileCheck %s --check-prefixes=BOTH-TRAP,TRAPV
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// RUN: %clang_cc1 -triple x86_64 -emit-llvm %s -o - -fsanitize=signed-integer-overflow | FileCheck %s --check-prefixes=BOTH-TRAP,CATCH_UB
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// COM: TODO: Support -ftrapv-handler.
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extern int abs(int x);
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int absi(int x) {
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// WRAPV: [[ABS:%.*]] = call i32 @llvm.abs.i32(i32 %0, i1 false)
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// WRAPV-NEXT: ret i32 [[ABS]]
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//
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// BOTH-TRAP: [[NEG:%.*]] = call { i32, i1 } @llvm.ssub.with.overflow.i32(i32 0, i32 [[X:%.*]])
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// BOTH-TRAP: [[NEGV:%.*]] = extractvalue { i32, i1 } [[NEG]], 0
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// BOTH-TRAP: [[OFL:%.*]] = extractvalue { i32, i1 } [[NEG]], 1
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// BOTH-TRAP: [[NOFL:%.*]] = xor i1 [[OFL]], true
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// BOTH-TRAP: br i1 [[NOFL]], label %[[CONT:.*]], label %[[TRAP:[a-zA-Z_.]*]]
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// BOTH-TRAP: [[TRAP]]:
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// TRAPV-NEXT: llvm.ubsantrap
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// CATCH_UB: @__ubsan_handle_negate_overflow
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// BOTH-TRAP-NEXT: unreachable
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// BOTH-TRAP: [[CONT]]:
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// BOTH-TRAP-NEXT: [[ABSCOND:%.*]] = icmp slt i32 [[X]], 0
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// BOTH-TRAP-NEXT: select i1 [[ABSCOND]], i32 [[NEGV]], i32 [[X]]
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return abs(x);
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}
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int babsi(int x) {
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// WRAPV: [[ABS:%.*]] = call i32 @llvm.abs.i32(i32 %0, i1 false)
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// WRAPV-NEXT: ret i32 [[ABS]]
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//
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// BOTH-TRAP: [[NEG:%.*]] = call { i32, i1 } @llvm.ssub.with.overflow.i32(i32 0, i32 [[X:%.*]])
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// BOTH-TRAP: [[NEGV:%.*]] = extractvalue { i32, i1 } [[NEG]], 0
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// BOTH-TRAP: [[OFL:%.*]] = extractvalue { i32, i1 } [[NEG]], 1
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// BOTH-TRAP: [[NOFL:%.*]] = xor i1 [[OFL]], true
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// BOTH-TRAP: br i1 [[NOFL]], label %[[CONT:.*]], label %[[TRAP:[a-zA-Z_.]*]]
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// BOTH-TRAP: [[TRAP]]:
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// TRAPV-NEXT: llvm.ubsantrap
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// CATCH_UB: @__ubsan_handle_negate_overflow
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// BOTH-TRAP-NEXT: unreachable
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// BOTH-TRAP: [[CONT]]:
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// BOTH-TRAP-NEXT: [[ABSCOND:%.*]] = icmp slt i32 [[X]], 0
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// BOTH-TRAP-NEXT: select i1 [[ABSCOND]], i32 [[NEGV]], i32 [[X]]
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return __builtin_abs(x);
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}
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