diff options
Diffstat (limited to 'lib/arm/comparesf2.S')
| -rw-r--r-- | lib/arm/comparesf2.S | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/lib/arm/comparesf2.S b/lib/arm/comparesf2.S index ee18203392dc..ce6f4b9efd00 100644 --- a/lib/arm/comparesf2.S +++ b/lib/arm/comparesf2.S @@ -59,12 +59,14 @@ DEFINE_COMPILERRT_FUNCTION(__nesf2) // Next, we check if a and b have the same or different signs. If they have // opposite signs, this eor will set the N flag. + it ne eorsne r12, r0, r1 // If a and b are equal (either both zeros or bit identical; again, we're // ignoring NaNs for now), this subtract will zero out r0. If they have the // same sign, the flags are updated as they would be for a comparison of the // absolute values of a and b. + it pl subspl r0, r2, r3 // If a is smaller in magnitude than b and both have the same sign, place @@ -77,23 +79,27 @@ DEFINE_COMPILERRT_FUNCTION(__nesf2) // still clear from the shift argument in orrs; if a is positive and b // negative, this places 0 in r0; if a is negative and b positive, -1 is // placed in r0. + it lo mvnlo r0, r1, asr #31 // If a is greater in magnitude than b and both have the same sign, place // the sign of b in r0. Thus, if both are negative and a < b, -1 is placed // in r0, which is the desired result. Conversely, if both are positive // and a > b, zero is placed in r0. + it hi movhi r0, r1, asr #31 // If you've been keeping track, at this point r0 contains -1 if a < b and // 0 if a >= b. All that remains to be done is to set it to 1 if a > b. // If a == b, then the Z flag is set, so we can get the correct final value // into r0 by simply or'ing with 1 if Z is clear. - orrne r0, r0, #1 + it ne + orrne r0, r0, #1 // Finally, we need to deal with NaNs. If either argument is NaN, replace // the value in r0 with 1. cmp r2, #0xff000000 + ite ls cmpls r3, #0xff000000 movhi r0, #1 bx lr @@ -108,12 +114,18 @@ DEFINE_COMPILERRT_FUNCTION(__gtsf2) mov r2, r0, lsl #1 mov r3, r1, lsl #1 orrs r12, r2, r3, lsr #1 + it ne eorsne r12, r0, r1 + it pl subspl r0, r2, r3 + it lo mvnlo r0, r1, asr #31 + it hi movhi r0, r1, asr #31 - orrne r0, r0, #1 + it ne + orrne r0, r0, #1 cmp r2, #0xff000000 + ite ls cmpls r3, #0xff000000 movhi r0, #-1 bx lr @@ -125,6 +137,7 @@ DEFINE_COMPILERRT_FUNCTION(__unordsf2) mov r3, r1, lsl #1 mov r0, #0 cmp r2, #0xff000000 + ite ls cmpls r3, #0xff000000 movhi r0, #1 bx lr |