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llvm-mirror/test/Transforms/Util/libcalls-shrinkwrap-double.ll
Rong Xu 40080ca01c Conditionally eliminate library calls where the result value is not used 
Summary:
This pass shrink-wraps a condition to some library calls where the call
result is not used. For example:
   sqrt(val);
 is transformed to
   if (val < 0)
     sqrt(val);
Even if the result of library call is not being used, the compiler cannot
safely delete the call because the function can set errno on error
conditions.
Note in many functions, the error condition solely depends on the incoming
parameter. In this optimization, we can generate the condition can lead to
the errno to shrink-wrap the call. Since the chances of hitting the error
condition is low, the runtime call is effectively eliminated.

These partially dead calls are usually results of C++ abstraction penalty
exposed by inlining. This optimization hits 108 times in 19 C/C++ programs
in SPEC2006.

Reviewers: hfinkel, mehdi_amini, davidxl

Subscribers: modocache, mgorny, mehdi_amini, xur, llvm-commits, beanz

Differential Revision: https://reviews.llvm.org/D24414

llvm-svn: 284542
2016-10-18 21:36:27 +00:00

242 lines
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; RUN: opt < %s -libcalls-shrinkwrap -S | FileCheck %s
; New PM
; RUN: opt < %s -passes=libcalls-shrinkwrap -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @test_range_error(double %value) {
entry:
%call_0 = call double @cosh(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt double %value, -7.100000e+02
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt double %value, 7.100000e+02
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT:[0-9]+]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_0 = call double @cosh(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_1 = call double @exp(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt double %value, -7.450000e+02
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt double %value, 7.090000e+02
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_1 = call double @exp(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_3 = call double @exp2(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt double %value, -1.074000e+03
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt double %value, 1.023000e+03
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_3 = call double @exp2(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_4 = call double @sinh(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp olt double %value, -7.100000e+02
; CHECK: [[COND2:%[0-9]+]] = fcmp ogt double %value, 7.100000e+02
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_4 = call double @sinh(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_5 = call double @expm1(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ogt double %value, 7.090000e+02
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_5 = call double @expm1(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
ret void
}
declare double @cosh(double)
declare double @exp(double)
declare double @exp2(double)
declare double @sinh(double)
declare double @expm1(double)
define void @test_domain_error(double %value) {
entry:
%call_00 = call double @acos(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt double %value, 1.000000e+00
; CHECK: [[COND2:%[0-9]+]] = fcmp olt double %value, -1.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_00 = call double @acos(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_01 = call double @asin(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt double %value, 1.000000e+00
; CHECK: [[COND2:%[0-9]+]] = fcmp olt double %value, -1.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_01 = call double @asin(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_02 = call double @cos(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp oeq double %value, 0xFFF0000000000000
; CHECK: [[COND2:%[0-9]+]] = fcmp oeq double %value, 0x7FF0000000000000
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_02 = call double @cos(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_03 = call double @sin(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp oeq double %value, 0xFFF0000000000000
; CHECK: [[COND2:%[0-9]+]] = fcmp oeq double %value, 0x7FF0000000000000
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_03 = call double @sin(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_04 = call double @acosh(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp olt double %value, 1.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_04 = call double @acosh(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_05 = call double @sqrt(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp olt double %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_05 = call double @sqrt(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_06 = call double @atanh(double %value)
; CHECK: [[COND1:%[0-9]+]] = fcmp oge double %value, 1.000000e+00
; CHECK: [[COND2:%[0-9]+]] = fcmp ole double %value, -1.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_06 = call double @atanh(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_07 = call double @log(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole double %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_07 = call double @log(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_08 = call double @log10(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole double %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_08 = call double @log10(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_09 = call double @log2(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole double %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_09 = call double @log2(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_10 = call double @logb(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole double %value, 0.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_10 = call double @logb(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%call_11 = call double @log1p(double %value)
; CHECK: [[COND:%[0-9]+]] = fcmp ole double %value, -1.000000e+00
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call_11 = call double @log1p(double %value)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
ret void
}
declare double @acos(double)
declare double @asin(double)
declare double @cos(double)
declare double @sin(double)
declare double @acosh(double)
declare double @sqrt(double)
declare double @atanh(double)
declare double @log(double)
declare double @log10(double)
declare double @log2(double)
declare double @logb(double)
declare double @log1p(double)
define void @test_pow(i32 %int_val, double %exp) {
%call = call double @pow(double 2.500000e+00, double %exp)
; CHECK: [[COND:%[0-9]+]] = fcmp ogt double %exp, 1.270000e+02
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call = call double @pow(double 2.500000e+00, double %exp)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%conv = sitofp i32 %int_val to double
%call1 = call double @pow(double %conv, double %exp)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt double %exp, 3.200000e+01
; CHECK: [[COND2:%[0-9]+]] = fcmp ole double %conv, 0.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call1 = call double @pow(double %conv, double %exp)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%conv2 = trunc i32 %int_val to i8
%conv3 = uitofp i8 %conv2 to double
%call4 = call double @pow(double %conv3, double %exp)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt double %exp, 1.280000e+02
; CHECK: [[COND2:%[0-9]+]] = fcmp ole double %conv3, 0.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call4 = call double @pow(double %conv3, double %exp)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
%conv5 = trunc i32 %int_val to i16
%conv6 = uitofp i16 %conv5 to double
%call7 = call double @pow(double %conv6, double %exp)
; CHECK: [[COND1:%[0-9]+]] = fcmp ogt double %exp, 6.400000e+01
; CHECK: [[COND2:%[0-9]+]] = fcmp ole double %conv6, 0.000000e+00
; CHECK: [[COND:%[0-9]+]] = or i1 [[COND2]], [[COND1]]
; CHECK: br i1 [[COND]], label %[[CALL_LABEL:cdce.call[0-9]*]], label %[[END_LABEL:cdce.end[0-9]*]], !prof ![[BRANCH_WEIGHT]]
; CHECK: [[CALL_LABEL]]:
; CHECK-NEXT: %call7 = call double @pow(double %conv6, double %exp)
; CHECK-NEXT: br label %[[END_LABEL]]
; CHECK: [[END_LABEL]]:
ret void
}
declare double @pow(double, double)
; CHECK: ![[BRANCH_WEIGHT]] = !{!"branch_weights", i32 1, i32 2000}
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