From: Andoni Arregi <andoni.arregui@gtd-gmbh.de>
To: newlib@sourceware.org
Cc: Andoni Arregi <andoni.arregui@gtd-gmbh.de>
Subject: [PATCH 3/4] Compare j as unsigned
Date: Wed, 12 Apr 2023 17:34:44 +0200 [thread overview]
Message-ID: <20230412153445.161047-4-andoni.arregui@gtd-gmbh.de> (raw)
In-Reply-To: <20230412153445.161047-1-andoni.arregui@gtd-gmbh.de>
j is int32_t and thus j<<31 is undefined if j==1.
Taken from FreeBSD commit bdd8abc6d6a93ce3ab8ad5db716222ee3110c4a3
---
newlib/libm/math/e_pow.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/newlib/libm/math/e_pow.c b/newlib/libm/math/e_pow.c
index f24a98f6e..0e2251f10 100644
--- a/newlib/libm/math/e_pow.c
+++ b/newlib/libm/math/e_pow.c
@@ -141,7 +141,7 @@ ivln2_l = 1.92596299112661746887e-08; /* 0x3E54AE0B, 0xF85DDF44 =1/ln2 tail*/
k = (iy>>20)-0x3ff; /* exponent */
if(k>20) {
j = ly>>(52-k);
- if((j<<(52-k))==ly) yisint = 2-(j&1);
+ if(((uint32_t)j<<(52-k))==ly) yisint = 2-(j&1);
} else if(ly==0) {
j = iy>>(20-k);
if((j<<(20-k))==iy) yisint = 2-(j&1);
--
2.40.0
next prev parent reply other threads:[~2023-04-12 15:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-12 15:34 [PATCH 0/4] Fix huge error for pow detected by Paul Zimmermann Andoni Arregi
2023-04-12 15:34 ` [PATCH 1/4] Fix missing sign for overflow/underflow where x is negative and y is large odd integer Andoni Arregi
2023-04-12 15:34 ` [PATCH 2/4] Fix x close to 1, y between 2^31 and 2^64 Andoni Arregi
2023-04-12 15:34 ` Andoni Arregi [this message]
2023-04-12 15:34 ` [PATCH 4/4] Replace always true if with else Andoni Arregi
2023-04-13 5:46 ` [PATCH 0/4] Fix huge error for pow detected by Paul Zimmermann Paul Zimmermann
2023-04-13 12:16 ` Paul Zimmermann
2023-04-13 14:39 ` Andoni Arregi
2023-04-13 17:37 ` Jeff Johnston
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