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llvm-6502/test/CodeGen/PowerPC/i64_fp_round.ll

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Add more PPC floating-point conversion instructions The P7 and A2 have additional floating-point conversion instructions which allow a direct two-instruction sequence (plus load/store) to convert from all combinations (signed/unsigned i32/i64) <--> (float/double) (on previous cores, only some combinations were directly available). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178480 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-01 17:52:07 +00:00
; RUN: llc -mcpu=pwr7 -mattr=-fpcvt < %s | FileCheck %s
This patch fixes failures in the SingleSource/Regression/C/uint64_to_float test case on PowerPC caused by rounding errors when converting from a 64-bit integer to a single-precision floating point. The reason for this are double-rounding effects, since on PowerPC we have to convert to an intermediate double-precision value first, which gets rounded to the final single-precision result. The patch fixes the problem by preparing the 64-bit integer so that the first conversion step to double-precision will always be exact, and the final rounding step will result in the correctly-rounded single-precision result. The generated code sequence is equivalent to what GCC would generate. When -enable-unsafe-fp-math is in effect, that extra effort is omitted and we accept possible rounding errors (just like GCC does as well). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166178 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-18 13:16:11 +00:00
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define float @test(i64 %x) nounwind readnone {
entry:
%conv = sitofp i64 %x to float
ret float %conv
}
; Verify that we get the code sequence needed to avoid double-rounding.
; Note that only parts of the sequence are checked for here, to allow
; for minor code generation differences.
Rewrite test to not use a FileCheck variable and redefine it on the same line. In preparation for the FileCheck functionality change which will allow using a variable later on the same line. No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168588 91177308-0d34-0410-b5e6-96231b3b80d8
2012-11-26 14:09:46 +00:00
; CHECK: sradi [[REG1:[0-9]+]], 3, 53
; CHECK: addi [[REG2:[0-9]+]], [[REG1]], 1
; CHECK: cmpldi 0, [[REG2]], 1
; CHECK: isel [[REG3:[0-9]+]], {{[0-9]+}}, 3, 1
; CHECK: std [[REG3]], -{{[0-9]+}}(1)
This patch fixes failures in the SingleSource/Regression/C/uint64_to_float test case on PowerPC caused by rounding errors when converting from a 64-bit integer to a single-precision floating point. The reason for this are double-rounding effects, since on PowerPC we have to convert to an intermediate double-precision value first, which gets rounded to the final single-precision result. The patch fixes the problem by preparing the 64-bit integer so that the first conversion step to double-precision will always be exact, and the final rounding step will result in the correctly-rounded single-precision result. The generated code sequence is equivalent to what GCC would generate. When -enable-unsafe-fp-math is in effect, that extra effort is omitted and we accept possible rounding errors (just like GCC does as well). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166178 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-18 13:16:11 +00:00
; Also check that with -enable-unsafe-fp-math we do not get that extra
; code sequence. Simply verify that there is no "isel" present.
Fix FileCheck --check-prefix lines. Various tests had sprung up over the years which had --check-prefix=ABC on the RUN line, but "CHECK-ABC:" later on. This happened to work before, but was strictly incorrect. FileCheck is getting stricter soon though. Patch by Ron Ofir. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188173 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-12 12:43:26 +00:00
; RUN: llc -mcpu=pwr7 -mattr=-fpcvt -enable-unsafe-fp-math < %s | FileCheck %s -check-prefix=CHECK-UNSAFE
This patch fixes failures in the SingleSource/Regression/C/uint64_to_float test case on PowerPC caused by rounding errors when converting from a 64-bit integer to a single-precision floating point. The reason for this are double-rounding effects, since on PowerPC we have to convert to an intermediate double-precision value first, which gets rounded to the final single-precision result. The patch fixes the problem by preparing the 64-bit integer so that the first conversion step to double-precision will always be exact, and the final rounding step will result in the correctly-rounded single-precision result. The generated code sequence is equivalent to what GCC would generate. When -enable-unsafe-fp-math is in effect, that extra effort is omitted and we accept possible rounding errors (just like GCC does as well). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166178 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-18 13:16:11 +00:00
; CHECK-UNSAFE-NOT: isel
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